/* * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. */ /************************************************************************/ /* */ /* PROJECT : exFAT & FAT12/16/32 File System */ /* FILE : core.c */ /* PURPOSE : sdFAT glue layer for supporting VFS */ /* */ /*----------------------------------------------------------------------*/ /* NOTES */ /* */ /* */ /************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* for mark_page_accessed() */ #include #include #include #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0) #include #endif #if LINUX_VERSION_CODE < KERNEL_VERSION(3,0,0) #error SDFAT only supports linux kernel version 3.0 or higher #endif #include "sdfat.h" #include "version.h" /* skip iterating emit_dots when dir is empty */ #define ITER_POS_FILLED_DOTS (2) /* type index declare at sdfat.h */ const char* FS_TYPE_STR[] = { "auto", "exfat", "vfat" }; static struct kset *sdfat_kset; static struct kmem_cache *sdfat_inode_cachep; static int sdfat_default_codepage = CONFIG_SDFAT_DEFAULT_CODEPAGE; static char sdfat_default_iocharset[] = CONFIG_SDFAT_DEFAULT_IOCHARSET; static const char sdfat_iocharset_with_utf8[] = "iso8859-1"; #ifdef CONFIG_SDFAT_TRACE_SB_LOCK static unsigned long __lock_jiffies; #endif static void sdfat_truncate(struct inode *inode, loff_t old_size); static int sdfat_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create); static struct inode *sdfat_iget(struct super_block *sb, loff_t i_pos); static struct inode *sdfat_build_inode(struct super_block *sb, const FILE_ID_T *fid, loff_t i_pos); static void sdfat_detach(struct inode *inode); static void sdfat_attach(struct inode *inode, loff_t i_pos); static inline unsigned long sdfat_hash(loff_t i_pos); static int __sdfat_write_inode(struct inode *inode, int sync); static int sdfat_sync_inode(struct inode *inode); static int sdfat_write_inode(struct inode *inode, struct writeback_control *wbc); static void sdfat_write_super(struct super_block *sb); static void sdfat_write_failed(struct address_space *mapping, loff_t to); static void sdfat_init_namebuf(DENTRY_NAMEBUF_T* nb); static int sdfat_alloc_namebuf(DENTRY_NAMEBUF_T* nb); static void sdfat_free_namebuf(DENTRY_NAMEBUF_T* nb); /************************************************************************* * INNER FUNCTIONS FOR FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY *************************************************************************/ static void __sdfat_writepage_end_io(struct bio *bio, int err); static inline void __lock_super(struct super_block *sb); static inline void __unlock_super(struct super_block *sb); static int __sdfat_create(struct inode *dir, struct dentry *dentry); static int __sdfat_revalidate(struct dentry *dentry); static int __sdfat_revalidate_ci(struct dentry *dentry, unsigned int flags); static int __sdfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync); static struct dentry* __sdfat_lookup(struct inode *dir, struct dentry *dentry); static int __sdfat_mkdir(struct inode *dir, struct dentry *dentry); static int __sdfat_show_options(struct seq_file *m, struct super_block *sb); static inline ssize_t __sdfat_blkdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, void *iov_u, loff_t offset, unsigned long nr_segs); static inline ssize_t __sdfat_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, void *iov_u, loff_t offset, loff_t count); static int __sdfat_d_hash(const struct dentry *dentry, struct qstr *qstr); static int __sdfat_d_hashi(const struct dentry *dentry, struct qstr *qstr); static int __sdfat_cmp(const struct dentry *parent, const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name); static int __sdfat_cmpi(const struct dentry *parent, const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name); /************************************************************************* * FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY *************************************************************************/ #if LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0) static void sdfat_writepage_end_io(struct bio *bio) { __sdfat_writepage_end_io(bio, bio->bi_error); } #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0) */ static void sdfat_writepage_end_io(struct bio *bio, int err) { if (test_bit(BIO_UPTODATE, &bio->bi_flags)) err = 0; __sdfat_writepage_end_io(bio, err); } #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0) static const char *sdfat_follow_link(struct dentry *dentry, void **cookie) { return simple_follow_link(dentry, cookie); } #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0) */ static void *sdfat_follow_link(struct dentry *dentry, struct nameidata *nd) { struct sdfat_inode_info *ei = SDFAT_I(dentry->d_inode); nd_set_link(nd, (char *)(ei->target)); return NULL; } #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) static inline int sdfat_remount_syncfs(struct super_block *sb) { sync_filesystem(sb); return 0; } #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) */ static inline int sdfat_remount_syncfs(struct super_block *sb) { /* * We don`t need to call sync_filesystem(sb), * Because VFS calls it. */ return 0; } #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0) static inline sector_t __sdfat_bio_sector(struct bio *bio) { return bio->bi_iter.bi_sector; } static inline void __sdfat_set_bio_iterate(struct bio *bio, sector_t sector, unsigned int size, unsigned int idx, unsigned int done) { struct bvec_iter* iter = &(bio->bi_iter); iter->bi_sector = sector; iter->bi_size = size; iter->bi_idx = idx; iter->bi_bvec_done = done; } static void __sdfat_truncate_pagecache(struct inode *inode, loff_t to, loff_t newsize) { truncate_pagecache(inode, newsize); } static int sdfat_d_hash(const struct dentry *dentry, struct qstr *qstr) { return __sdfat_d_hash(dentry, qstr); } static int sdfat_d_hashi(const struct dentry *dentry, struct qstr *qstr) { return __sdfat_d_hashi(dentry, qstr); } static int sdfat_cmp(const struct dentry *parent, const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { return __sdfat_cmp(parent, dentry, len, str, name); } static int sdfat_cmpi(const struct dentry *parent, const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { return __sdfat_cmpi(parent, dentry, len, str, name); } //instead of sdfat_readdir static int sdfat_iterate(struct file *filp, struct dir_context *ctx) { struct inode *inode = filp->f_path.dentry->d_inode; struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); FS_INFO_T *fsi = &(sbi->fsi); DIR_ENTRY_T de; DENTRY_NAMEBUF_T *nb = &(de.NameBuf); unsigned long inum; loff_t cpos; int err = 0, fake_offset = 0; sdfat_init_namebuf(nb); __lock_super(sb); cpos = ctx->pos; if ((fsi->vol_type == EXFAT) || (inode->i_ino == SDFAT_ROOT_INO)) { if (!dir_emit_dots(filp, ctx)) goto out; if (ctx->pos == ITER_POS_FILLED_DOTS) { cpos = 0; fake_offset = 1; } } if (cpos & (DENTRY_SIZE - 1)) { err = -ENOENT; goto out; } /* name buffer should be allocated before use */ err = sdfat_alloc_namebuf(nb); if (err) goto out; get_new: SDFAT_I(inode)->fid.size = i_size_read(inode); SDFAT_I(inode)->fid.rwoffset = cpos >> DENTRY_SIZE_BITS; if (cpos >= SDFAT_I(inode)->fid.size) goto end_of_dir; err = fsapi_readdir(inode, &de); if (err) { // at least we tried to read a sector // move cpos to next sector position (should be aligned) if (err == -EIO) { cpos += 1 << (sb->s_blocksize_bits); cpos &= ~((u32)sb->s_blocksize-1); } err = -EIO; goto end_of_dir; } cpos = SDFAT_I(inode)->fid.rwoffset << DENTRY_SIZE_BITS; if (!nb->lfn[0]) goto end_of_dir; if (!memcmp(nb->sfn, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH)) { inum = inode->i_ino; } else if (!memcmp(nb->sfn, DOS_PAR_DIR_NAME, DOS_NAME_LENGTH)) { inum = parent_ino(filp->f_path.dentry); } else { loff_t i_pos = ((loff_t) SDFAT_I(inode)->fid.start_clu << 32) | ((SDFAT_I(inode)->fid.rwoffset-1) & 0xffffffff); struct inode *tmp = sdfat_iget(sb, i_pos); if (tmp) { inum = tmp->i_ino; iput(tmp); } else { inum = iunique(sb, SDFAT_ROOT_INO); } } /* Before calling dir_emit(), sb_lock should be released. * Because page fault can occur in dir_emit() when the size of buffer given * from user is larger than one page size */ __unlock_super(sb); if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum, (de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG)) goto out_unlocked; __lock_super(sb); ctx->pos = cpos; goto get_new; end_of_dir: if (!cpos && fake_offset) cpos = ITER_POS_FILLED_DOTS; ctx->pos = cpos; out: __unlock_super(sb); out_unlocked: /* * To improve performance, free namebuf after unlock sb_lock. * If namebuf is not allocated, this function do nothing */ sdfat_free_namebuf(nb); return err; } #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0) */ static inline sector_t __sdfat_bio_sector(struct bio *bio) { return bio->bi_sector; } static inline void __sdfat_set_bio_iterate(struct bio *bio, sector_t sector, unsigned int size, unsigned int idx, unsigned int done) { bio->bi_sector = sector; bio->bi_idx = idx; bio->bi_size = size; //PAGE_CACHE_SIZE; } static void __sdfat_truncate_pagecache(struct inode *inode, loff_t to, loff_t newsize) { truncate_pagecache(inode, to, newsize); } static int sdfat_d_hash(const struct dentry *dentry, const struct inode *inode, struct qstr *qstr) { return __sdfat_d_hash(dentry, qstr); } static int sdfat_d_hashi(const struct dentry *dentry, const struct inode *inode, struct qstr *qstr) { return __sdfat_d_hashi(dentry, qstr); } static int sdfat_cmp(const struct dentry *parent, const struct inode *pinode, const struct dentry *dentry, const struct inode *inode, unsigned int len, const char *str, const struct qstr *name) { return __sdfat_cmp(parent, dentry, len, str, name); } static int sdfat_cmpi(const struct dentry *parent, const struct inode *pinode, const struct dentry *dentry, const struct inode *inode, unsigned int len, const char *str, const struct qstr *name) { return __sdfat_cmpi(parent, dentry, len, str, name); } static int sdfat_readdir(struct file *filp, void *dirent, filldir_t filldir) { struct inode *inode = filp->f_path.dentry->d_inode; struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); FS_INFO_T *fsi = &(sbi->fsi); DIR_ENTRY_T de; DENTRY_NAMEBUF_T *nb = &(de.NameBuf); unsigned long inum; loff_t cpos; int err = 0, fake_offset = 0; sdfat_init_namebuf(nb); __lock_super(sb); cpos = filp->f_pos; /* Fake . and .. for the root directory. */ if ((fsi->vol_type == EXFAT) || (inode->i_ino == SDFAT_ROOT_INO)) { while (cpos < ITER_POS_FILLED_DOTS) { if (inode->i_ino == SDFAT_ROOT_INO) inum = SDFAT_ROOT_INO; else if (cpos == 0) inum = inode->i_ino; else /* (cpos == 1) */ inum = parent_ino(filp->f_path.dentry); if (filldir(dirent, "..", cpos+1, cpos, inum, DT_DIR) < 0) goto out; cpos++; filp->f_pos++; } if (cpos == ITER_POS_FILLED_DOTS) { cpos = 0; fake_offset = 1; } } if (cpos & (DENTRY_SIZE - 1)) { err = -ENOENT; goto out; } /* name buffer should be allocated before use */ err = sdfat_alloc_namebuf(nb); if (err) goto out; get_new: SDFAT_I(inode)->fid.size = i_size_read(inode); SDFAT_I(inode)->fid.rwoffset = cpos >> DENTRY_SIZE_BITS; if (cpos >= SDFAT_I(inode)->fid.size) goto end_of_dir; err = fsapi_readdir(inode, &de); if (err) { // at least we tried to read a sector // move cpos to next sector position (should be aligned) if (err == -EIO) { cpos += 1 << (sb->s_blocksize_bits); cpos &= ~((u32)sb->s_blocksize-1); } err = -EIO; goto end_of_dir; } cpos = SDFAT_I(inode)->fid.rwoffset << DENTRY_SIZE_BITS; if (!nb->lfn[0]) goto end_of_dir; if (!memcmp(nb->sfn, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH)) { inum = inode->i_ino; } else if (!memcmp(nb->sfn, DOS_PAR_DIR_NAME, DOS_NAME_LENGTH)) { inum = parent_ino(filp->f_path.dentry); } else { loff_t i_pos = ((loff_t) SDFAT_I(inode)->fid.start_clu << 32) | ((SDFAT_I(inode)->fid.rwoffset-1) & 0xffffffff); struct inode *tmp = sdfat_iget(sb, i_pos); if (tmp) { inum = tmp->i_ino; iput(tmp); } else { inum = iunique(sb, SDFAT_ROOT_INO); } } /* Before calling dir_emit(), sb_lock should be released. * Because page fault can occur in dir_emit() when the size of buffer given * from user is larger than one page size */ __unlock_super(sb); if (filldir(dirent, nb->lfn, strlen(nb->lfn), cpos, inum, (de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG) < 0) goto out_unlocked; __lock_super(sb); filp->f_pos = cpos; goto get_new; end_of_dir: if (!cpos && fake_offset) cpos = ITER_POS_FILLED_DOTS; filp->f_pos = cpos; out: __unlock_super(sb); out_unlocked: /* * To improve performance, free namebuf after unlock sb_lock. * If namebuf is not allocated, this function do nothing */ sdfat_free_namebuf(nb); return err; } #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 9, 0) /* EMPTY */ #else static inline struct inode *file_inode(const struct file *f) { return f->f_dentry->d_inode; } #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0) static inline int __is_sb_dirty(struct super_block *sb) { return SDFAT_SB(sb)->s_dirt; } static inline void __set_sb_clean(struct super_block *sb) { SDFAT_SB(sb)->s_dirt = 0; } /* Workqueue wrapper for sdfat_write_super () */ static void __write_super_delayed(struct work_struct *work) { struct sdfat_sb_info *sbi; struct super_block *sb; sbi = container_of(work, struct sdfat_sb_info, write_super_work.work); sb = sbi->host_sb; /* XXX: Is this needed? */ if (!sb || !down_read_trylock(&sb->s_umount)) { DMSG("%s: skip delayed work(write_super).\n", __func__); return; } DMSG("%s: do delayed_work(write_super).\n", __func__); spin_lock(&sbi->work_lock); sbi->write_super_queued = 0; spin_unlock(&sbi->work_lock); sdfat_write_super(sb); up_read(&sb->s_umount); } static void setup_sdfat_sync_super_wq(struct super_block *sb) { struct sdfat_sb_info* sbi = SDFAT_SB(sb); mutex_init(&sbi->s_lock); spin_lock_init(&sbi->work_lock); INIT_DELAYED_WORK(&sbi->write_super_work, __write_super_delayed); sbi->host_sb = sb; } static inline bool __cancel_delayed_work_sync(struct sdfat_sb_info *sbi) { return cancel_delayed_work_sync(&sbi->write_super_work); } static inline void lock_super(struct super_block *sb) { struct sdfat_sb_info *sbi = SDFAT_SB(sb); mutex_lock(&sbi->s_lock); } static inline void unlock_super(struct super_block *sb) { struct sdfat_sb_info *sbi = SDFAT_SB(sb); mutex_unlock(&sbi->s_lock); } static int sdfat_revalidate(struct dentry *dentry, unsigned int flags) { if (flags & LOOKUP_RCU) return -ECHILD; return __sdfat_revalidate(dentry); } static int sdfat_revalidate_ci(struct dentry *dentry, unsigned int flags) { if (flags & LOOKUP_RCU) return -ECHILD; return __sdfat_revalidate_ci(dentry, flags); } static struct inode *sdfat_iget(struct super_block *sb, loff_t i_pos) { struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct sdfat_inode_info *info; struct hlist_head *head = sbi->inode_hashtable + sdfat_hash(i_pos); struct inode *inode = NULL; spin_lock(&sbi->inode_hash_lock); hlist_for_each_entry(info, head, i_hash_fat) { BUG_ON(info->vfs_inode.i_sb != sb); if (i_pos != info->i_pos) continue; inode = igrab(&info->vfs_inode); if (inode) break; } spin_unlock(&sbi->inode_hash_lock); return inode; } #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0) */ static inline int __is_sb_dirty(struct super_block *sb) { return sb->s_dirt; } static inline void __set_sb_clean(struct super_block *sb) { sb->s_dirt = 0; } static void setup_sdfat_sync_super_wq(struct super_block *sb) { struct sdfat_sb_info* sbi = SDFAT_SB(sb); sbi->host_sb = sb; } static inline bool __cancel_delayed_work_sync(struct sdfat_sb_info *sbi) { /* DO NOTHING */ return 0; } static inline void clear_inode(struct inode *inode) { end_writeback(inode); } static int sdfat_revalidate(struct dentry *dentry, struct nameidata *nd) { if (nd && nd->flags & LOOKUP_RCU) return -ECHILD; return __sdfat_revalidate(dentry); } static int sdfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd) { if (nd && nd->flags & LOOKUP_RCU) return -ECHILD; return __sdfat_revalidate_ci(dentry, nd ? nd->flags : 0); } static struct inode *sdfat_iget(struct super_block *sb, loff_t i_pos) { struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct sdfat_inode_info *info; struct hlist_node *node; struct hlist_head *head = sbi->inode_hashtable + sdfat_hash(i_pos); struct inode *inode = NULL; spin_lock(&sbi->inode_hash_lock); hlist_for_each_entry(info, node, head, i_hash_fat) { BUG_ON(info->vfs_inode.i_sb != sb); if (i_pos != info->i_pos) continue; inode = igrab(&info->vfs_inode); if (inode) break; } spin_unlock(&sbi->inode_hash_lock); return inode; } #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0) static struct dentry *sdfat_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { return __sdfat_lookup(dir, dentry); } #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0) */ static struct dentry *sdfat_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { return __sdfat_lookup(dir, dentry); } #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) /* NOTHING NOW */ #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) */ #define GLOBAL_ROOT_UID (0) #define GLOBAL_ROOT_GID (0) static inline bool uid_eq(uid_t left, uid_t right) { return left == right; } static inline bool gid_eq(gid_t left, gid_t right) { return left == right; } static inline uid_t from_kuid_munged(struct user_namespace *to, uid_t kuid) { return kuid; } static inline gid_t from_kgid_munged(struct user_namespace *to, gid_t kgid) { return kgid; } static inline uid_t make_kuid(struct user_namespace *from, uid_t uid) { return uid; } static inline gid_t make_kgid(struct user_namespace *from, gid_t gid) { return gid; } #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0) static struct dentry* __d_make_root(struct inode *root_inode) { return d_make_root(root_inode); } static void __sdfat_do_truncate(struct inode *inode, loff_t old, loff_t new) { down_write(&SDFAT_I(inode)->truncate_lock); truncate_setsize(inode, new); sdfat_truncate(inode, old); up_write(&SDFAT_I(inode)->truncate_lock); } static sector_t sdfat_aop_bmap(struct address_space *mapping, sector_t block) { sector_t blocknr; /* sdfat_get_cluster() assumes the requested blocknr isn't truncated. */ down_read(&SDFAT_I(mapping->host)->truncate_lock); blocknr = generic_block_bmap(mapping, block, sdfat_get_block); up_read(&SDFAT_I(mapping->host)->truncate_lock); return blocknr; } static int sdfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) { return __sdfat_mkdir(dir, dentry); } static int sdfat_show_options(struct seq_file *m, struct dentry *root) { return __sdfat_show_options(m, root->d_sb); } #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0) */ static inline void set_nlink(struct inode *inode, unsigned int nlink) { inode->i_nlink = nlink; } static struct dentry* __d_make_root(struct inode *root_inode) { return d_alloc_root(root_inode); } static void __sdfat_do_truncate(struct inode *inode, loff_t old, loff_t new) { truncate_setsize(inode, new); sdfat_truncate(inode, old); } static sector_t sdfat_aop_bmap(struct address_space *mapping, sector_t block) { sector_t blocknr; /* sdfat_get_cluster() assumes the requested blocknr isn't truncated. */ down_read(&mapping->host->i_alloc_sem); blocknr = generic_block_bmap(mapping, block, sdfat_get_block); up_read(&mapping->host->i_alloc_sem); return blocknr; } static int sdfat_mkdir(struct inode *dir, struct dentry *dentry, int mode) { return __sdfat_mkdir(dir, dentry); } static int sdfat_show_options(struct seq_file *m, struct vfsmount *mnt) { return __sdfat_show_options(m, mnt->mnt_sb); } #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0) #define __sdfat_generic_file_fsync(filp, start, end, datasync) \ generic_file_fsync(filp, start, end, datasync) static int sdfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync) { return __sdfat_file_fsync(filp, start, end, datasync); } #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0) */ #define __sdfat_generic_file_fsync(filp, start, end, datasync) \ generic_file_fsync(filp, datasync) static int sdfat_file_fsync(struct file *filp, int datasync) { return __sdfat_file_fsync(filp, 0, 0, datasync); } #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0) */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0) static ssize_t sdfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter, loff_t offset) { struct file *file = iocb->ki_filp; struct address_space *mapping = file->f_mapping; struct inode *inode = mapping->host; size_t count = iov_iter_count(iter); int rw = iov_iter_rw(iter); return __sdfat_direct_IO(rw, iocb, inode, (void*)iter, offset, count); } #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) static ssize_t sdfat_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t offset) { struct file *file = iocb->ki_filp; struct address_space *mapping = file->f_mapping; struct inode *inode = mapping->host; size_t count = iov_iter_count(iter); return __sdfat_direct_IO(rw, iocb, inode, (void*)iter, offset, count); } #else static ssize_t sdfat_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t offset, unsigned long nr_segs) { struct file *file = iocb->ki_filp; struct address_space *mapping = file->f_mapping; struct inode *inode = mapping->host; size_t count = iov_length(iov, nr_segs); return __sdfat_direct_IO(rw, iocb, inode, (void*)iov, offset, count); } #endif #if LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0) static inline ssize_t __sdfat_blkdev_direct_IO(int unused, struct kiocb *iocb, struct inode *inode, void *iov_u, loff_t offset, unsigned long nr_segs) { struct iov_iter *iter = (struct iov_iter *)iov_u; return blockdev_direct_IO(iocb, inode, iter, offset, sdfat_get_block); } #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) static inline ssize_t __sdfat_blkdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, void *iov_u, loff_t offset, unsigned long nr_segs) { struct iov_iter *iter = (struct iov_iter *)iov_u; return blockdev_direct_IO(rw, iocb, inode, iter, offset, sdfat_get_block); } #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0) static inline ssize_t __sdfat_blkdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, void *iov_u, loff_t offset, unsigned long nr_segs) { const struct iovec *iov = (const struct iovec *)iov_u; return blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, sdfat_get_block); } #else static inline ssize_t __sdfat_blkdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, void *iov_u, loff_t offset, unsigned long nr_segs) { const struct iovec *iov = (const struct iovec *)iov_u; return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, offset, nr_segs, sdfat_get_block, NULL); } #endif #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,00) static int sdfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) { return __sdfat_create(dir, dentry); } #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) static int sdfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, struct nameidata *nd) { return __sdfat_create(dir, dentry); } #else static int sdfat_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) { return __sdfat_create(dir, dentry); } #endif /************************************************************************* * WRAP FUNCTIONS FOR DEBUGGING *************************************************************************/ #ifdef CONFIG_SDFAT_TRACE_SB_LOCK static inline void __lock_super(struct super_block *sb) { lock_super(sb); __lock_jiffies = jiffies; } static inline void __unlock_super(struct super_block *sb) { int time = ((jiffies - __lock_jiffies) * 1000 / HZ); /* FIXME : error message should be modified */ if (time > 10) EMSG("lock_super in %s (%d ms) \n", __func__, time); unlock_super(sb); } #else /* CONFIG_SDFAT_TRACE_SB_LOCK */ static inline void __lock_super(struct super_block *sb) { lock_super(sb); } static inline void __unlock_super(struct super_block *sb) { unlock_super(sb); } #endif /* CONFIG_SDFAT_TRACE_SB_LOCK */ /************************************************************************* * NORMAL FUNCTIONS *************************************************************************/ static inline loff_t sdfat_make_i_pos(FILE_ID_T *fid) { return ((loff_t) fid->dir.dir << 32) | (fid->entry & 0xffffffff); } /*======================================================================*/ /* Directory Entry Name Buffer Operations */ /*======================================================================*/ static void sdfat_init_namebuf(DENTRY_NAMEBUF_T* nb) { nb->lfn = NULL; nb->sfn = NULL; nb->lfnbuf_len = 0; nb->sfnbuf_len = 0; } static int sdfat_alloc_namebuf(DENTRY_NAMEBUF_T* nb) { nb->lfn = __getname(); if (!nb->lfn) return -ENOMEM; nb->sfn = nb->lfn + MAX_VFSNAME_BUF_SIZE; nb->lfnbuf_len = MAX_VFSNAME_BUF_SIZE; nb->sfnbuf_len = MAX_VFSNAME_BUF_SIZE; return 0; } static void sdfat_free_namebuf(DENTRY_NAMEBUF_T* nb) { if (!nb->lfn) return; __putname(nb->lfn); sdfat_init_namebuf(nb); } /*======================================================================*/ /* Directory Entry Operations */ /*======================================================================*/ #define SDFAT_DSTATE_LOCKED (void *)(0xCAFE2016) #define SDFAT_DSTATE_UNLOCKED (void *)(0x00000000) static inline void __lock_d_revalidate(struct dentry *dentry) { spin_lock(&dentry->d_lock); dentry->d_fsdata = SDFAT_DSTATE_LOCKED; spin_unlock(&dentry->d_lock); } static inline void __unlock_d_revalidate(struct dentry *dentry) { spin_lock(&dentry->d_lock); dentry->d_fsdata = SDFAT_DSTATE_UNLOCKED; spin_unlock(&dentry->d_lock); } /* __check_dstate_locked requires dentry->d_lock */ static inline int __check_dstate_locked(struct dentry *dentry) { if (dentry->d_fsdata == SDFAT_DSTATE_LOCKED) return 1; return 0; } /* * If new entry was created in the parent, it could create the 8.3 * alias (the shortname of logname). So, the parent may have the * negative-dentry which matches the created 8.3 alias. * * If it happened, the negative dentry isn't actually negative * anymore. So, drop it. */ static int __sdfat_revalidate_common(struct dentry *dentry) { int ret = 1; spin_lock(&dentry->d_lock); if ((!dentry->d_inode) && (!__check_dstate_locked(dentry) && (dentry->d_time != dentry->d_parent->d_inode->i_version))) { ret = 0; } spin_unlock(&dentry->d_lock); return ret; } static int __sdfat_revalidate(struct dentry *dentry) { /* This is not negative dentry. Always valid. */ if (dentry->d_inode) return 1; return __sdfat_revalidate_common(dentry); } static int __sdfat_revalidate_ci(struct dentry *dentry, unsigned int flags) { /* * This is not negative dentry. Always valid. * * Note, rename() to existing directory entry will have ->d_inode, * and will use existing name which isn't specified name by user. * * We may be able to drop this positive dentry here. But dropping * positive dentry isn't good idea. So it's unsupported like * rename("filename", "FILENAME") for now. */ if (dentry->d_inode) return 1; #if 0 /* Blocked below code for lookup_one_len() called by stackable FS */ /* * This may be nfsd (or something), anyway, we can't see the * intent of this. So, since this can be for creation, drop it. */ if (!flags) return 0; #endif /* * Drop the negative dentry, in order to make sure to use the * case sensitive name which is specified by user if this is * for creation. */ if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) return 0; return __sdfat_revalidate_common(dentry); } /* returns the length of a struct qstr, ignoring trailing dots */ static unsigned int __sdfat_striptail_len(unsigned int len, const char *name) { while (len && name[len - 1] == '.') len--; return len; } static unsigned int sdfat_striptail_len(const struct qstr *qstr) { return __sdfat_striptail_len(qstr->len, qstr->name); } /* * Compute the hash for the sdfat name corresponding to the dentry. * Note: if the name is invalid, we leave the hash code unchanged so * that the existing dentry can be used. The sdfat fs routines will * return ENOENT or EINVAL as appropriate. */ static int __sdfat_d_hash(const struct dentry *dentry, struct qstr *qstr) { qstr->hash = full_name_hash(qstr->name, sdfat_striptail_len(qstr)); return 0; } /* * Compute the hash for the sdfat name corresponding to the dentry. * Note: if the name is invalid, we leave the hash code unchanged so * that the existing dentry can be used. The sdfat fs routines will * return ENOENT or EINVAL as appropriate. */ static int __sdfat_d_hashi(const struct dentry *dentry, struct qstr *qstr) { struct nls_table *t = SDFAT_SB(dentry->d_sb)->nls_io; const unsigned char *name; unsigned int len; unsigned long hash; name = qstr->name; len = sdfat_striptail_len(qstr); hash = init_name_hash(); while (len--) hash = partial_name_hash(nls_tolower(t, *name++), hash); qstr->hash = end_name_hash(hash); return 0; } /* * Case sensitive compare of two sdfat names. */ static int __sdfat_cmp(const struct dentry *parent, const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { unsigned int alen, blen; /* A filename cannot end in '.' or we treat it like it has none */ alen = sdfat_striptail_len(name); blen = __sdfat_striptail_len(len, str); if (alen == blen) { if (strncmp(name->name, str, alen) == 0) return 0; } return 1; } /* * Case insensitive compare of two sdfat names. */ static int __sdfat_cmpi(const struct dentry *parent, const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { struct nls_table *t = SDFAT_SB(parent->d_sb)->nls_io; unsigned int alen, blen; /* A filename cannot end in '.' or we treat it like it has none */ alen = sdfat_striptail_len(name); blen = __sdfat_striptail_len(len, str); if (alen == blen) { if (nls_strnicmp(t, name->name, str, alen) == 0) return 0; } return 1; } static const struct dentry_operations sdfat_dentry_ops = { .d_revalidate = sdfat_revalidate, .d_hash = sdfat_d_hash, .d_compare = sdfat_cmp, }; static const struct dentry_operations sdfat_ci_dentry_ops = { .d_revalidate = sdfat_revalidate_ci, .d_hash = sdfat_d_hashi, .d_compare = sdfat_cmpi, }; #ifdef CONFIG_SDFAT_DFR /*----------------------------------------------------------------------*/ /* Defragmentation related */ /*----------------------------------------------------------------------*/ /** * @fn defrag_cleanup_reqs * @brief clean-up defrag info depending on error flag * @return void * @param sb super block * @param error error flag */ static void defrag_cleanup_reqs(INOUT struct super_block *sb, IN int error) { struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct defrag_info *sb_dfr = &(sbi->dfr_info); struct defrag_info *ino_dfr = NULL, *tmp = NULL; /* sdfat patch 0.96 : sbi->dfr_info crash problem */ __lock_super(sb); /* Clean-up ino_dfr */ if (!error) { list_for_each_entry_safe(ino_dfr, tmp, &sb_dfr->entry, entry) { struct inode *inode = &(container_of(ino_dfr, struct sdfat_inode_info, dfr_info)->vfs_inode); mutex_lock(&ino_dfr->lock); atomic_set(&ino_dfr->stat, DFR_INO_STAT_IDLE); list_del(&ino_dfr->entry); ino_dfr->chunks = NULL; ino_dfr->nr_chunks = 0; INIT_LIST_HEAD(&ino_dfr->entry); BUG_ON(!mutex_is_locked(&ino_dfr->lock)); mutex_unlock(&ino_dfr->lock); iput(inode); } } /* Clean-up sb_dfr */ sb_dfr->chunks = NULL; sb_dfr->nr_chunks = 0; INIT_LIST_HEAD(&sb_dfr->entry); /* Clear dfr_new_clus page */ memset(sbi->dfr_new_clus, 0, PAGE_SIZE); sbi->dfr_new_idx = 1; memset(sbi->dfr_page_wb, 0, PAGE_SIZE); sbi->dfr_hint_clus = sbi->dfr_hint_idx = sbi->dfr_reserved_clus = 0; __unlock_super(sb); } /** * @fn defrag_validate_pages * @brief validate and mark dirty for victiim pages * @return 0 on success, -errno otherwise * @param inode inode * @param chunk given chunk * @remark protected by i_mutex and super_lock */ static int defrag_validate_pages( IN struct inode *inode, IN struct defrag_chunk_info *chunk) { struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct page *page = NULL; unsigned int i_size = 0, page_off = 0, page_nr = 0; int buf_i = 0, i = 0, err = 0; i_size = i_size_read(inode); page_off = chunk->f_clus * PAGES_PER_CLUS(sb); page_nr = (i_size / PAGE_SIZE) + ((i_size % PAGE_SIZE)? 1 : 0); if ( (i_size <= 0) || (page_nr <= 0) ) { dfr_err("inode %p, i_size %d, page_nr %d", inode, i_size, page_nr); return -EINVAL; } /* Get victim pages * and check its dirty/writeback/mapped state */ for (i = 0; i < min((int)(page_nr - page_off), (int)(chunk->nr_clus * PAGES_PER_CLUS(sb))); i++) { page = find_get_page(inode->i_mapping, page_off + i); if (page) if (!trylock_page(page)) { put_page(page); page = NULL; } if (!page) { dfr_debug("get/lock_page() failed, index %d", i); err = -EINVAL; goto error; } sbi->dfr_pagep[buf_i++] = page; if (PageError(page) || !PageUptodate(page) || PageDirty(page) || PageWriteback(page) || page_mapped(page)) { dfr_debug("page %p, err %d, uptodate %d, dirty %d, wb %d, mapped %d", page, PageError(page), PageUptodate(page), PageDirty(page), PageWriteback(page), page_mapped(page)); err = -EINVAL; goto error; } set_bit( (page->index & (PAGES_PER_CLUS(sb) - 1)), (volatile unsigned long *)&(sbi->dfr_page_wb[chunk->new_idx + i/PAGES_PER_CLUS(sb)]) ); page = NULL; } /** * All pages in the chunks are valid. */ i_size -= (chunk->f_clus * (sbi->fsi.cluster_size)); BUG_ON( ((i_size/PAGE_SIZE) + ((i_size % PAGE_SIZE)? 1 : 0)) != (page_nr - page_off) ); for (i = 0; i < buf_i; i++) { struct buffer_head *bh = NULL, *head = NULL; int bh_idx = 0; page = sbi->dfr_pagep[i]; BUG_ON(!page); /* Mark dirty in page */ set_page_dirty(page); mark_page_accessed(page); /* Attach empty BHs */ if (!page_has_buffers(page)) create_empty_buffers(page, 1 << inode->i_blkbits, 0); /* Mark dirty in BHs */ bh = head = page_buffers(page); BUG_ON(!bh && !i_size); do { if ( (bh_idx >= 1) && (bh_idx >= (i_size >> inode->i_blkbits)) ) { clear_buffer_dirty(bh); } else { if (PageUptodate(page)) if (!buffer_uptodate(bh)) set_buffer_uptodate(bh); /* Set this bh as delay */ set_buffer_new(bh); set_buffer_delay(bh); mark_buffer_dirty(bh); } bh_idx++; bh = bh->b_this_page; } while (bh != head); /* Mark this page accessed */ mark_page_accessed(page); i_size -= PAGE_SIZE; } error: /* Unlock and put refs for pages */ for (i = 0; i < buf_i; i++) { BUG_ON(!sbi->dfr_pagep[i]); unlock_page(sbi->dfr_pagep[i]); put_page(sbi->dfr_pagep[i]); } memset(sbi->dfr_pagep, 0, sizeof(PAGE_SIZE)); return err; } /** * @fn defrag_validate_reqs * @brief validate defrag requests * @return negative if all requests not valid, 0 otherwise * @param sb super block * @param chunks given chunks */ static int defrag_validate_reqs( IN struct super_block *sb, INOUT struct defrag_chunk_info *chunks) { struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct defrag_info *sb_dfr = &(sbi->dfr_info); int i = 0, err = 0, err_cnt = 0; /* Validate all reqs */ for (i = REQ_HEADER_IDX + 1; i < sb_dfr->nr_chunks; i++) { struct defrag_chunk_info *chunk = NULL; struct inode *inode = NULL; struct defrag_info *ino_dfr = NULL; chunk = &chunks[i]; /* Check inode */ __lock_super(sb); inode = sdfat_iget(sb, chunk->i_pos); if (!inode) { dfr_debug("inode not found, i_pos %08llx", chunk->i_pos); chunk->stat = DFR_CHUNK_STAT_ERR; err_cnt++; __unlock_super(sb); continue; } __unlock_super(sb); dfr_debug("req[%d] inode %p, i_pos %08llx, f_clus %d, " "d_clus %08x, nr %d, prev %08x, next %08x", i, inode, chunk->i_pos, chunk->f_clus, chunk->d_clus, chunk->nr_clus, chunk->prev_clus, chunk->next_clus); /** * Lock ordering: i_mutex -> lock_super */ mutex_lock(&inode->i_mutex); __lock_super(sb); /* Check if enough buffers exist for chunk->new_idx */ if ( (sbi->dfr_new_idx + chunk->nr_clus) >= (PAGE_SIZE/sizeof(int)) ) { dfr_err("dfr_new_idx %d, chunk->nr_clus %d", sbi->dfr_new_idx, chunk->nr_clus); err = -ENOSPC; goto unlock; } /* Reserve clusters for defrag with DA */ err = fsapi_dfr_reserve_clus(sb, chunk->nr_clus); if (err) goto unlock; /* Check clusters */ err = fsapi_dfr_validate_clus(inode, chunk, 0); if (err) { fsapi_dfr_reserve_clus(sb, 0 - chunk->nr_clus); dfr_debug("Cluster validation: err %d", err); goto unlock; } /* Check pages */ err = defrag_validate_pages(inode, chunk); if (err) { fsapi_dfr_reserve_clus(sb, 0 - chunk->nr_clus); dfr_debug("Page validation: err %d", err); goto unlock; } /* Mark IGNORE flag to victim AU */ if (sbi->options.improved_allocation & SDFAT_ALLOC_SMART) fsapi_dfr_mark_ignore(sb, chunk->d_clus); ino_dfr = &(SDFAT_I(inode)->dfr_info); mutex_lock(&ino_dfr->lock); /* Update chunk info */ chunk->stat = DFR_CHUNK_STAT_REQ; chunk->new_idx = sbi->dfr_new_idx; /* Update ino_dfr info */ if (list_empty(&(ino_dfr->entry))) { list_add_tail(&ino_dfr->entry, &sb_dfr->entry); ino_dfr->chunks = chunk; igrab(inode); } ino_dfr->nr_chunks++; atomic_set(&ino_dfr->stat, DFR_INO_STAT_REQ); BUG_ON(!mutex_is_locked(&ino_dfr->lock)); mutex_unlock(&ino_dfr->lock); /* Reserved buffers for chunk->new_idx */ sbi->dfr_new_idx += chunk->nr_clus; unlock: if (err) { chunk->stat = DFR_CHUNK_STAT_ERR; err_cnt++; } iput(inode); __unlock_super(sb); mutex_unlock(&inode->i_mutex); } /* Return error if all chunks are invalid */ if (err_cnt == sb_dfr->nr_chunks - 1) { dfr_debug("%s failed (err_cnt %d)", __func__, err_cnt); return -ENXIO; } return 0; } /** * @fn defrag_check_fs_busy * @brief check if this module busy * @return 0 when idle, 1 otherwise * @param sb super block * @param reserved_clus # of reserved clusters * @param queued_pages # of queued pages */ static int defrag_check_fs_busy( IN struct super_block *sb, OUT int *reserved_clus, OUT int *queued_pages) { FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi); int err = 0; *reserved_clus = *queued_pages = 0; __lock_super(sb); *reserved_clus = fsi->reserved_clusters; *queued_pages = atomic_read(&SDFAT_SB(sb)->stat_n_pages_queued); if (*reserved_clus || *queued_pages) err = 1; __unlock_super(sb); return err; } /** * @fn sdfat_ioctl_defrag_req * @brief ioctl to send defrag requests * @return 0 on success, -errno otherwise * @param inode inode * @param uarg given requests */ static int sdfat_ioctl_defrag_req( IN struct inode *inode, INOUT unsigned int *uarg) { struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct defrag_info *sb_dfr = &(sbi->dfr_info); struct defrag_chunk_header head; struct defrag_chunk_info *chunks = NULL; unsigned int len = 0; int err = 0; unsigned long timeout = 0; /* Check overlapped defrag */ if (atomic_cmpxchg(&sb_dfr->stat, DFR_SB_STAT_IDLE, DFR_SB_STAT_REQ)) { dfr_debug("sb_dfr->stat %d", atomic_read(&sb_dfr->stat)); return -EBUSY; } /* Check if defrag required */ __lock_super(sb); if (!fsapi_dfr_check_dfr_required(sb, NULL, NULL, NULL)) { dfr_debug("Not enough space left for defrag (err %d)", -ENOSPC); atomic_set(&sb_dfr->stat, DFR_SB_STAT_IDLE); __unlock_super(sb); return -ENOSPC; } __unlock_super(sb); /* Copy args */ memset(&head, 0, sizeof(struct defrag_chunk_header)); err = copy_from_user(&head, uarg, sizeof(struct defrag_chunk_info)); ERR_HANDLE(err); /* If FS busy, cancel defrag */ if ( !(head.mode == DFR_MODE_TEST) ) { int reserved_clus = 0, queued_pages = 0; err = defrag_check_fs_busy(sb, &reserved_clus, &queued_pages); if (err) { dfr_debug("FS busy, cancel defrag (reserved_clus %d, queued_pages %d)", reserved_clus, queued_pages); err = -EBUSY; goto error; } } /* Total length is saved in the chunk header's nr_chunks field */ len = head.nr_chunks; ERR_HANDLE2(!len, err, -EINVAL); dfr_debug("IOC_DFR_REQ started (mode %d, nr_req %d)", head.mode, len - 1); if ( get_order(len * sizeof(struct defrag_chunk_info)) > MAX_ORDER) { dfr_debug("len %d, sizeof(struct defrag_chunk_info) %d, MAX_ORDER %d", len, sizeof(struct defrag_chunk_info), MAX_ORDER); err = -EINVAL; goto error; } chunks = alloc_pages_exact(len * sizeof(struct defrag_chunk_info), GFP_KERNEL | __GFP_ZERO); ERR_HANDLE2(!chunks, err, -ENOMEM) err = copy_from_user(chunks, uarg, len * sizeof(struct defrag_chunk_info)); ERR_HANDLE(err); /* Initialize sb_dfr */ sb_dfr->chunks = chunks; sb_dfr->nr_chunks = len; /* Validate reqs & mark defrag/dirty */ err = defrag_validate_reqs(sb, sb_dfr->chunks); ERR_HANDLE(err); atomic_set(&sb_dfr->stat, DFR_SB_STAT_VALID); /* Wait for defrag completion */ if (head.mode == DFR_MODE_ONESHOT) timeout = 0; else if (head.mode & DFR_MODE_BACKGROUND) timeout = DFR_DEFAULT_TIMEOUT; else timeout = DFR_MIN_TIMEOUT; dfr_debug("Wait for completion (timeout %ld)", timeout); init_completion(&sbi->dfr_complete); timeout = wait_for_completion_timeout(&sbi->dfr_complete, timeout); if (!timeout) { /* Force defrag_updat_fat() after timeout. */ dfr_debug("Force sync(), mode %d, left-timeout %ld", head.mode, timeout); down_read(&sb->s_umount); sync_inodes_sb(sb); __lock_super(sb); fsapi_dfr_update_fat_next(sb); fsapi_sync_fs(sb, 1); #ifdef CONFIG_SDFAT_DFR_DEBUG /* SPO test */ fsapi_dfr_spo_test(sb, DFR_SPO_FAT_NEXT, __func__); #endif fsapi_dfr_update_fat_prev(sb, 1); fsapi_sync_fs(sb, 1); __unlock_super(sb); up_read(&sb->s_umount); } #ifdef CONFIG_SDFAT_DFR_DEBUG /* SPO test */ fsapi_dfr_spo_test(sb, DFR_SPO_NORMAL, __func__); #endif __lock_super(sb); /* Send DISCARD to clean-ed AUs */ fsapi_dfr_check_discard(sb); #ifdef CONFIG_SDFAT_DFR_DEBUG /* SPO test */ fsapi_dfr_spo_test(sb, DFR_SPO_DISCARD, __func__); #endif /* Unmark IGNORE flag to all victim AUs */ fsapi_dfr_unmark_ignore_all(sb); __unlock_super(sb); err = copy_to_user(uarg, sb_dfr->chunks, sizeof(struct defrag_chunk_info) * len); ERR_HANDLE(err); error: /* Clean-up sb_dfr & ino_dfr */ defrag_cleanup_reqs(sb, err); if (chunks) free_pages_exact(chunks, len * sizeof(struct defrag_chunk_info)); /* Set sb_dfr's state as IDLE */ atomic_set(&sb_dfr->stat, DFR_SB_STAT_IDLE); dfr_debug("IOC_DFR_REQ done (err %d)", err); return err; } /** * @fn sdfat_ioctl_defrag_trav * @brief ioctl to traverse given directory for defrag * @return 0 on success, -errno otherwise * @param inode inode * @param uarg output buffer */ static int sdfat_ioctl_defrag_trav( IN struct inode *inode, INOUT unsigned int *uarg) { struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct defrag_info *sb_dfr = &(sbi->dfr_info); struct defrag_trav_arg *args = (struct defrag_trav_arg *) sbi->dfr_pagep; struct defrag_trav_header *header = (struct defrag_trav_header *) args; int err = 0; /* Check overlapped defrag */ if (atomic_cmpxchg(&sb_dfr->stat, DFR_SB_STAT_IDLE, DFR_SB_STAT_REQ)) { dfr_debug("sb_dfr->stat %d", atomic_read(&sb_dfr->stat)); return -EBUSY; } /* Check if defrag required */ __lock_super(sb); if (!fsapi_dfr_check_dfr_required(sb, NULL, NULL, NULL)) { dfr_debug("Not enough space left for defrag (err %d)", -ENOSPC); atomic_set(&sb_dfr->stat, DFR_SB_STAT_IDLE); __unlock_super(sb); return -ENOSPC; } __unlock_super(sb); /* Copy args */ err = copy_from_user(args, uarg, PAGE_SIZE); ERR_HANDLE(err); /** * Check args. * ROOT directory has i_pos = 0 and start_clus = 0 . */ if ( !(header->type & DFR_TRAV_TYPE_HEADER) ) { err = -EINVAL; dfr_debug("type %d, i_pos %08llx, start_clus %08x", header->type, header->i_pos, header->start_clus); goto error; } /* If FS busy, cancel defrag */ if ( !(header->type & DFR_TRAV_TYPE_TEST) ) { unsigned int reserved_clus = 0, queued_pages = 0; err = defrag_check_fs_busy(sb, &reserved_clus, &queued_pages); if (err) { dfr_debug("FS busy, cancel defrag (reserved_clus %d, queued_pages %d)", reserved_clus, queued_pages); err = -EBUSY; goto error; } } /* Scan given directory and gather info */ mutex_lock(&inode->i_mutex); __lock_super(sb); err = fsapi_dfr_scan_dir(sb, (void *)args); __unlock_super(sb); mutex_unlock(&inode->i_mutex); ERR_HANDLE(err); /* Copy the result to user */ err = copy_to_user(uarg, args, PAGE_SIZE); ERR_HANDLE(err); error: memset(sbi->dfr_pagep, 0, PAGE_SIZE); atomic_set(&sb_dfr->stat, DFR_SB_STAT_IDLE); return err; } /** * @fn sdfat_ioctl_defrag_info * @brief ioctl to get HW param info * @return 0 on success, -errno otherwise * @param sb super block * @param uarg output buffer */ static int sdfat_ioctl_defrag_info( IN struct super_block *sb, OUT unsigned int *uarg) { struct defrag_info_arg info_arg; int err = 0; memset(&info_arg, 0, sizeof(struct defrag_info_arg)); __lock_super(sb); err = fsapi_dfr_get_info(sb, &info_arg); __unlock_super(sb); ERR_HANDLE(err); dfr_debug("IOC_DFR_INFO: sec_per_au %d, hidden_sectors %d", info_arg.sec_per_au, info_arg.hidden_sectors); err = copy_to_user(uarg, &info_arg, sizeof(struct defrag_info_arg)); error: return err; } #endif /* CONFIG_SDFAT_DFR */ static inline int __do_dfr_map_cluster(struct inode *inode, u32 clu_offset, unsigned int* clus_ptr) { #ifdef CONFIG_SDFAT_DFR return fsapi_dfr_map_clus(inode, clu_offset, clus_ptr); #else return 0; #endif } static inline int __check_dfr_on(struct inode *inode, loff_t start, loff_t end, const char *fname) { #ifdef CONFIG_SDFAT_DFR struct defrag_info *ino_dfr = &(SDFAT_I(inode)->dfr_info); if ( (atomic_read(&ino_dfr->stat) == DFR_INO_STAT_REQ) && fsapi_dfr_check_dfr_on(inode, start, end, 0, fname) ) return 1; #endif return 0; } static inline int __cancel_dfr_work(struct inode *inode, loff_t start, loff_t end, const char *fname) { #ifdef CONFIG_SDFAT_DFR struct defrag_info *ino_dfr = &(SDFAT_I(inode)->dfr_info); /* Cancel DEFRAG */ if (atomic_read(&ino_dfr->stat) == DFR_INO_STAT_REQ) fsapi_dfr_check_dfr_on(inode, start, end, 1, fname); #endif return 0; } static inline int __dfr_writepage_end_io(struct page *page) { #ifdef CONFIG_SDFAT_DFR struct defrag_info *ino_dfr = &(SDFAT_I(page->mapping->host)->dfr_info); if (atomic_read(&ino_dfr->stat) == DFR_INO_STAT_REQ) fsapi_dfr_writepage_endio(page); #endif return 0; } static inline void __init_dfr_info(struct inode *inode) { #ifdef CONFIG_SDFAT_DFR memset(&(SDFAT_I(inode)->dfr_info), 0, sizeof(struct defrag_info)); INIT_LIST_HEAD(&(SDFAT_I(inode)->dfr_info.entry)); mutex_init(&(SDFAT_I(inode)->dfr_info.lock)); #endif } static inline int __alloc_dfr_mem_if_required(struct super_block *sb) { #ifdef CONFIG_SDFAT_DFR struct sdfat_sb_info *sbi = SDFAT_SB(sb); if (!sbi->options.defrag) return 0; memset(&sbi->dfr_info, 0, sizeof(struct defrag_info)); INIT_LIST_HEAD(&(sbi->dfr_info.entry)); mutex_init(&(sbi->dfr_info.lock)); sbi->dfr_new_clus = kzalloc(PAGE_SIZE, GFP_KERNEL); if (!sbi->dfr_new_clus) { dfr_debug("error %d", -ENOMEM); return -ENOMEM; } sbi->dfr_new_idx = 1; sbi->dfr_page_wb = kzalloc(PAGE_SIZE, GFP_KERNEL); if (!sbi->dfr_page_wb) { dfr_debug("error %d", -ENOMEM); return -ENOMEM; } sbi->dfr_pagep = alloc_pages_exact( sizeof(struct page *) * PAGES_PER_AU(sb), GFP_KERNEL | __GFP_ZERO); if (!sbi->dfr_pagep) { dfr_debug("error %d", -ENOMEM); return -ENOMEM; } #endif return 0; } static void __free_dfr_mem_if_required(struct super_block *sb) { #ifdef CONFIG_SDFAT_DFR struct sdfat_sb_info *sbi = SDFAT_SB(sb); if (sbi->dfr_pagep) { free_pages_exact(sbi->dfr_pagep, sizeof(struct page *) * PAGES_PER_AU(sb)); sbi->dfr_pagep = NULL; } if (sbi->dfr_page_wb) { kfree(sbi->dfr_page_wb); sbi->dfr_page_wb = NULL; } if (sbi->dfr_new_clus) { kfree(sbi->dfr_new_clus); sbi->dfr_new_clus = NULL; } #endif } static int sdfat_file_mmap( struct file *file, struct vm_area_struct *vm_struct) { __cancel_dfr_work(file->f_mapping->host, (loff_t)vm_struct->vm_start, (loff_t)(vm_struct->vm_end - 1), __func__); return generic_file_mmap(file, vm_struct); } static int sdfat_ioctl_volume_id(struct inode *dir) { struct sdfat_sb_info *sbi = SDFAT_SB(dir->i_sb); FS_INFO_T *fsi = &(sbi->fsi); return fsi->vol_id; } static int sdfat_dfr_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { #ifdef CONFIG_SDFAT_DFR switch (cmd) { case SDFAT_IOCTL_DFR_INFO: { struct super_block *sb = inode->i_sb; FS_INFO_T *fsi = &SDFAT_SB(sb)->fsi; unsigned int __user *uarg = (unsigned int __user *) arg; __lock_super(sb); /* Check FS type (FAT32 only) */ if (fsi->vol_type != FAT32) { dfr_err("Defrag not supported, vol_type %d", fsi->vol_type); __unlock_super(sb); return -EPERM; } /* Check if SB's defrag option enabled */ if ( !(SDFAT_SB(sb)->options.defrag) ) { dfr_err("Defrag not supported, sbi->options.defrag %d", SDFAT_SB(sb)->options.defrag); __unlock_super(sb); return -EPERM; } /* Only IOCTL on mount-point allowed */ if (filp->f_path.mnt->mnt_root != filp->f_path.dentry) { dfr_err("IOC_DFR_INFO only allowed on ROOT, root %p, dentry %p", filp->f_path.mnt->mnt_root, filp->f_path.dentry); __unlock_super(sb); return -EPERM; } __unlock_super(sb); return sdfat_ioctl_defrag_info(sb, uarg); } case SDFAT_IOCTL_DFR_TRAV: { struct super_block *sb = inode->i_sb; FS_INFO_T *fsi = &SDFAT_SB(sb)->fsi; unsigned int __user *uarg = (unsigned int __user *) arg; __lock_super(sb); /* Check FS type (FAT32 only) */ if (fsi->vol_type != FAT32) { dfr_err("Defrag not supported, vol_type %d", fsi->vol_type); __unlock_super(sb); return -EPERM; } /* Check if SB's defrag option enabled */ if ( !(SDFAT_SB(sb)->options.defrag) ) { dfr_err("Defrag not supported, sbi->options.defrag %d", SDFAT_SB(sb)->options.defrag); __unlock_super(sb); return -EPERM; } __unlock_super(sb); return sdfat_ioctl_defrag_trav(inode, uarg); } case SDFAT_IOCTL_DFR_REQ: { struct super_block *sb = inode->i_sb; FS_INFO_T *fsi = &SDFAT_SB(sb)->fsi; unsigned int __user *uarg = (unsigned int __user *) arg; __lock_super(sb); /* Check if FS_ERROR occured */ if (sb->s_flags & MS_RDONLY) { dfr_err("RDONLY partition (err %d)", -EPERM); __unlock_super(sb); return -EPERM; } /* Check FS type (FAT32 only) */ if (fsi->vol_type != FAT32) { dfr_err("Defrag not supported, vol_type %d", fsi->vol_type); __unlock_super(sb); return -EINVAL; } /* Check if SB's defrag option enabled */ if ( !(SDFAT_SB(sb)->options.defrag) ) { dfr_err("Defrag not supported, sbi->options.defrag %d", SDFAT_SB(sb)->options.defrag); __unlock_super(sb); return -EPERM; } /* Only IOCTL on mount-point allowed */ if (filp->f_path.mnt->mnt_root != filp->f_path.dentry) { dfr_err("IOC_DFR_INFO only allowed on ROOT, root %p, dentry %p", filp->f_path.mnt->mnt_root, filp->f_path.dentry); __unlock_super(sb); return -EINVAL; } __unlock_super(sb); return sdfat_ioctl_defrag_req(inode, uarg); } #ifdef CONFIG_SDFAT_DFR_DEBUG case SDFAT_IOCTL_DFR_SPO_FLAG: { struct sdfat_sb_info *sbi = SDFAT_SB(inode->i_sb); int ret = 0; ret = get_user(sbi->dfr_spo_flag, (int __user *)arg); dfr_debug("dfr_spo_flag %d", sbi->dfr_spo_flag); return ret; } #endif /* CONFIG_SDFAT_DFR_DEBUG */ } #endif /* CONFIG_SDFAT_DFR */ /* Inappropriate ioctl for device */ return -ENOTTY; } static int sdfat_dbg_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) { #ifdef CONFIG_SDFAT_DBG_IOCTL struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); unsigned int flags; switch (cmd) { case SDFAT_IOC_GET_DEBUGFLAGS: flags = sbi->debug_flags; return put_user(flags, (int __user *)arg); case SDFAT_IOC_SET_DEBUGFLAGS: flags = 0; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (get_user(flags, (int __user *) arg)) return -EFAULT; __lock_super(sb); sbi->debug_flags = flags; __unlock_super(sb); return 0; case SDFAT_IOCTL_PANIC: panic("ioctl panic for test"); /* COULD NOT REACH HEAR */ return 0; } #endif /* CONFIG_SDFAT_DBG_IOCTL */ return -ENOTTY; } static long sdfat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = file_inode(filp); int err; if (cmd == SDFAT_IOCTL_GET_VOLUME_ID) return sdfat_ioctl_volume_id(inode); err = sdfat_dfr_ioctl(inode, filp, cmd, arg); if (err != -ENOTTY) return err; /* -ENOTTY if inappropriate ioctl for device */ return sdfat_dbg_ioctl(inode, filp, cmd, arg); } static void __sdfat_writepage_end_io(struct bio *bio, int err) { struct page *page = bio->bi_io_vec->bv_page; struct super_block *sb = page->mapping->host->i_sb; ASSERT(bio->bi_vcnt == 1); /* Single page endio */ ASSERT(bio->bi_rw & 1); /* Write */ if (err){ SetPageError(page); mapping_set_error(page->mapping, err); } __dfr_writepage_end_io(page); #ifdef CONFIG_SDFAT_TRACE_IO { //struct sdfat_sb_info *sbi = SDFAT_SB(bio->bi_bdev->bd_super); struct sdfat_sb_info *sbi = SDFAT_SB(sb); sbi->stat_n_pages_written++; if (page->mapping->host == sb->s_bdev->bd_inode) sbi->stat_n_bdev_pages_written++; /* 4 MB = 1024 pages => 0.4 sec (approx.) 32 KB = 64 pages => 0.025 sec Min. average latency b/w msgs. ~= 0.025 sec */ if ((sbi->stat_n_pages_written & 63) == 0) { DMSG("STAT:%u, %u, %u, %u (Sector #: %u)\n", sbi->stat_n_pages_added, sbi->stat_n_pages_written, sbi->stat_n_bdev_pages_witten, sbi->stat_n_pages_confused, (unsigned int)__sdfat_bio_sector(bio)); } } #endif end_page_writeback(page); bio_put(bio); // Update trace info. atomic_dec(&SDFAT_SB(sb)->stat_n_pages_queued); } static int __support_write_inode_sync(struct super_block *sb) { #ifdef CONFIG_SDFAT_SUPPORT_DIR_SYNC #ifdef CONFIG_SDFAT_DELAYED_META_DIRTY struct sdfat_sb_info *sbi = SDFAT_SB(sb); if (sbi->fsi.vol_type != EXFAT) return 0; #endif return 1; #endif return 0; } static int __sdfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync) { struct inode *inode = filp->f_mapping->host; struct super_block *sb = inode->i_sb; int res, err = 0; res = __sdfat_generic_file_fsync(filp, start, end, datasync); if(!__support_write_inode_sync(sb)) err = fsapi_sync_fs(sb, 1); return res ? res : err; } static const struct file_operations sdfat_dir_operations = { .llseek = generic_file_llseek, .read = generic_read_dir, #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,00) .iterate = sdfat_iterate, #else .readdir = sdfat_readdir, #endif .fsync = sdfat_file_fsync, .unlocked_ioctl = sdfat_generic_ioctl, }; static int __sdfat_create(struct inode *dir, struct dentry *dentry) { struct super_block *sb = dir->i_sb; struct inode *inode; struct timespec ts; FILE_ID_T fid; loff_t i_pos; int err; __lock_super(sb); TMSG("%s entered\n", __func__); ts = CURRENT_TIME_SEC; err = fsapi_create(dir, (u8 *) dentry->d_name.name, FM_REGULAR, &fid); if (err) goto out; __lock_d_revalidate(dentry); dir->i_version++; dir->i_ctime = dir->i_mtime = dir->i_atime = ts; if (IS_DIRSYNC(dir)) (void) sdfat_sync_inode(dir); else mark_inode_dirty(dir); i_pos = sdfat_make_i_pos(&fid); inode = sdfat_build_inode(sb, &fid, i_pos); if (IS_ERR(inode)) { err = PTR_ERR(inode); goto out; } inode->i_version++; inode->i_mtime = inode->i_atime = inode->i_ctime = ts; /* timestamp is already written, so mark_inode_dirty() is unneeded. */ d_instantiate(dentry, inode); out: __unlock_d_revalidate(dentry); __unlock_super(sb); TMSG("%s exited with err(%d)\n", __func__, err); return err; } static int sdfat_find(struct inode *dir, struct qstr *qname, FILE_ID_T *fid) { int err; if (qname->len == 0) return -ENOENT; err = fsapi_lookup(dir, (u8 *) qname->name, fid); if (err) return -ENOENT; return 0; } static int sdfat_d_anon_disconn(struct dentry *dentry) { return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); } static struct dentry* __sdfat_lookup(struct inode *dir, struct dentry *dentry) { struct super_block *sb = dir->i_sb; struct inode *inode; struct dentry *alias; int err; FILE_ID_T fid; loff_t i_pos; u64 ret; mode_t i_mode; __lock_super(sb); TMSG("%s entered\n", __func__); err = sdfat_find(dir, &dentry->d_name, &fid); if (err) { if (err == -ENOENT) { inode = NULL; goto out; } goto error; } i_pos = sdfat_make_i_pos(&fid); inode = sdfat_build_inode(sb, &fid, i_pos); if (IS_ERR(inode)) { err = PTR_ERR(inode); goto error; } i_mode = inode->i_mode; if (S_ISLNK(i_mode)) { SDFAT_I(inode)->target = kmalloc((i_size_read(inode)+1), GFP_KERNEL); if (!SDFAT_I(inode)->target) { err = -ENOMEM; goto error; } fsapi_read_link(dir, &fid, SDFAT_I(inode)->target, i_size_read(inode), &ret); *(SDFAT_I(inode)->target + i_size_read(inode)) = '\0'; } alias = d_find_alias(inode); /* * Checking "alias->d_parent == dentry->d_parent" to make sure * FS is not corrupted (especially double linked dir). */ if (alias && alias->d_parent == dentry->d_parent && !sdfat_d_anon_disconn(alias)) { /* * Unhashed alias is able to exist because of revalidate() * called by lookup_fast. You can easily make this status * by calling create and lookup concurrently * In such case, we reuse an alias instead of new dentry */ if (d_unhashed(alias)) { BUG_ON(alias->d_name.hash_len != dentry->d_name.hash_len); sdfat_msg(sb, KERN_INFO, "rehashed a dentry(%p) " "in read lookup", alias); d_drop(dentry); d_rehash(alias); } else if (!S_ISDIR(i_mode)) { /* * This inode has non anonymous-DCACHE_DISCONNECTED * dentry. This means, the user did ->lookup() by an * another name (longname vs 8.3 alias of it) in past. * * Switch to new one for reason of locality if possible. */ d_move(alias, dentry); } iput(inode); __unlock_super(sb); TMSG("%s exited\n", __func__); return alias; } else { dput(alias); } out: /* initialize d_time even though it is positive dentry */ dentry->d_time = dir->i_version; __unlock_super(sb); dentry = d_splice_alias(inode, dentry); TMSG("%s exited\n", __func__); return dentry; error: __unlock_super(sb); TMSG("%s exited with err(%d)\n", __func__, err); return ERR_PTR(err); } static int sdfat_unlink(struct inode *dir, struct dentry *dentry) { struct inode *inode = dentry->d_inode; struct super_block *sb = dir->i_sb; struct timespec ts; int err; __lock_super(sb); TMSG("%s entered\n", __func__); ts = CURRENT_TIME_SEC; SDFAT_I(inode)->fid.size = i_size_read(inode); __cancel_dfr_work(inode, 0, SDFAT_I(inode)->fid.size, __func__); err = fsapi_unlink(dir, &(SDFAT_I(inode)->fid)); if (err) goto out; __lock_d_revalidate(dentry); dir->i_version++; dir->i_mtime = dir->i_atime = ts; if (IS_DIRSYNC(dir)) (void) sdfat_sync_inode(dir); else mark_inode_dirty(dir); clear_nlink(inode); inode->i_mtime = inode->i_atime = ts; sdfat_detach(inode); dentry->d_time = dir->i_version; out: __unlock_d_revalidate(dentry); __unlock_super(sb); TMSG("%s exited with err(%d)\n", __func__, err); return err; } static int sdfat_symlink(struct inode *dir, struct dentry *dentry, const char *target) { struct super_block *sb = dir->i_sb; struct inode *inode; struct timespec ts; FILE_ID_T fid; loff_t i_pos; int err; u64 len = (u64) strlen(target); u64 ret; /* symlink option check */ if (!SDFAT_SB(sb)->options.symlink) return -ENOTSUPP; __lock_super(sb); TMSG("%s entered\n", __func__); ts = CURRENT_TIME_SEC; err = fsapi_create(dir, (u8 *) dentry->d_name.name, FM_SYMLINK, &fid); if (err) goto out; err = fsapi_write_link(dir, &fid, (char *) target, len, &ret); if (err) { fsapi_remove(dir, &fid); goto out; } __lock_d_revalidate(dentry); dir->i_version++; dir->i_ctime = dir->i_mtime = dir->i_atime = ts; if (IS_DIRSYNC(dir)) (void) sdfat_sync_inode(dir); else mark_inode_dirty(dir); i_pos = sdfat_make_i_pos(&fid); inode = sdfat_build_inode(sb, &fid, i_pos); if (IS_ERR(inode)) { err = PTR_ERR(inode); goto out; } inode->i_version++; inode->i_mtime = inode->i_atime = inode->i_ctime = ts; /* timestamp is already written, so mark_inode_dirty() is unneeded. */ SDFAT_I(inode)->target = kmalloc((len+1), GFP_KERNEL); if (!SDFAT_I(inode)->target) { err = -ENOMEM; goto out; } memcpy(SDFAT_I(inode)->target, target, len+1); d_instantiate(dentry, inode); out: __unlock_d_revalidate(dentry); __unlock_super(sb); TMSG("%s exited with err(%d)\n", __func__, err); return err; } static int __sdfat_mkdir(struct inode *dir, struct dentry *dentry) { struct super_block *sb = dir->i_sb; struct inode *inode; struct timespec ts; FILE_ID_T fid; loff_t i_pos; int err; __lock_super(sb); TMSG("%s entered\n", __func__); ts = CURRENT_TIME_SEC; err = fsapi_mkdir(dir, (u8 *) dentry->d_name.name, &fid); if (err) goto out; __lock_d_revalidate(dentry); dir->i_version++; dir->i_ctime = dir->i_mtime = dir->i_atime = ts; if (IS_DIRSYNC(dir)) (void) sdfat_sync_inode(dir); else mark_inode_dirty(dir); inc_nlink(dir); i_pos = sdfat_make_i_pos(&fid); inode = sdfat_build_inode(sb, &fid, i_pos); if (IS_ERR(inode)) { err = PTR_ERR(inode); goto out; } inode->i_version++; inode->i_mtime = inode->i_atime = inode->i_ctime = ts; /* timestamp is already written, so mark_inode_dirty() is unneeded. */ d_instantiate(dentry, inode); out: __unlock_d_revalidate(dentry); __unlock_super(sb); TMSG("%s exited with err(%d)\n", __func__, err); return err; } static int sdfat_rmdir(struct inode *dir, struct dentry *dentry) { struct inode *inode = dentry->d_inode; struct super_block *sb = dir->i_sb; struct timespec ts; int err; __lock_super(sb); TMSG("%s entered\n", __func__); ts = CURRENT_TIME_SEC; SDFAT_I(inode)->fid.size = i_size_read(inode); err = fsapi_rmdir(dir, &(SDFAT_I(inode)->fid)); if (err) goto out; __lock_d_revalidate(dentry); dir->i_version++; dir->i_mtime = dir->i_atime = ts; if (IS_DIRSYNC(dir)) (void) sdfat_sync_inode(dir); else mark_inode_dirty(dir); drop_nlink(dir); clear_nlink(inode); inode->i_mtime = inode->i_atime = ts; sdfat_detach(inode); dentry->d_time = dir->i_version; out: __unlock_d_revalidate(dentry); __unlock_super(sb); TMSG("%s exited with err(%d)\n", __func__, err); return err; } static int sdfat_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { struct inode *old_inode, *new_inode; struct super_block *sb = old_dir->i_sb; struct timespec ts; loff_t i_pos; int err; __lock_super(sb); TMSG("%s entered\n", __func__); old_inode = old_dentry->d_inode; new_inode = new_dentry->d_inode; ts = CURRENT_TIME_SEC; SDFAT_I(old_inode)->fid.size = i_size_read(old_inode); __cancel_dfr_work(old_inode, 0, 1, __func__); err = fsapi_rename(old_dir, &(SDFAT_I(old_inode)->fid), new_dir, new_dentry); if (err) goto out; __lock_d_revalidate(old_dentry); __lock_d_revalidate(new_dentry); new_dir->i_version++; new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime = ts; if (IS_DIRSYNC(new_dir)) (void) sdfat_sync_inode(new_dir); else mark_inode_dirty(new_dir); i_pos = sdfat_make_i_pos(&(SDFAT_I(old_inode)->fid)); sdfat_detach(old_inode); sdfat_attach(old_inode, i_pos); if (IS_DIRSYNC(new_dir)) (void) sdfat_sync_inode(old_inode); else mark_inode_dirty(old_inode); if ((S_ISDIR(old_inode->i_mode)) && (old_dir != new_dir)) { drop_nlink(old_dir); if (!new_inode) inc_nlink(new_dir); } old_dir->i_version++; old_dir->i_ctime = old_dir->i_mtime = ts; if (IS_DIRSYNC(old_dir)) (void) sdfat_sync_inode(old_dir); else mark_inode_dirty(old_dir); if (new_inode) { sdfat_detach(new_inode); /* skip drop_nlink if new_inode already has been dropped */ if (new_inode->i_nlink) { drop_nlink(new_inode); if (S_ISDIR(new_inode->i_mode)) drop_nlink(new_inode); } else { EMSG("%s : abnormal access to an inode dropped\n", __func__); WARN_ON(new_inode->i_nlink == 0); } new_inode->i_ctime = ts; #if 0 (void) sdfat_sync_inode(new_inode); #endif } out: __unlock_d_revalidate(old_dentry); __unlock_d_revalidate(new_dentry); __unlock_super(sb); TMSG("%s exited with err(%d)\n", __func__, err); return err; } static int sdfat_cont_expand(struct inode *inode, loff_t size) { struct address_space *mapping = inode->i_mapping; loff_t start = i_size_read(inode), count = size - i_size_read(inode); int err, err2; err = generic_cont_expand_simple(inode, size); if (err) return err; inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; mark_inode_dirty(inode); if (!IS_SYNC(inode)) return 0; err = filemap_fdatawrite_range(mapping, start, start + count - 1); err2 = sync_mapping_buffers(mapping); err = (err)?(err):(err2); err2 = write_inode_now(inode, 1); err = (err)?(err):(err2); if (err) return err; return filemap_fdatawait_range(mapping, start, start + count - 1); } static int sdfat_allow_set_time(struct sdfat_sb_info *sbi, struct inode *inode) { mode_t allow_utime = sbi->options.allow_utime; if (!uid_eq(current_fsuid(), inode->i_uid)) { if (in_group_p(inode->i_gid)) allow_utime >>= 3; if (allow_utime & MAY_WRITE) return 1; } /* use a default check */ return 0; } static int sdfat_sanitize_mode(const struct sdfat_sb_info *sbi, struct inode *inode, umode_t *mode_ptr) { mode_t i_mode, mask, perm; i_mode = inode->i_mode; if (S_ISREG(i_mode) || S_ISLNK(i_mode)) mask = sbi->options.fs_fmask; else mask = sbi->options.fs_dmask; perm = *mode_ptr & ~(S_IFMT | mask); /* Of the r and x bits, all (subject to umask) must be present.*/ if ((perm & (S_IRUGO | S_IXUGO)) != (i_mode & (S_IRUGO|S_IXUGO))) return -EPERM; if (sdfat_mode_can_hold_ro(inode)) { /* Of the w bits, either all (subject to umask) or none must be present. */ if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask))) return -EPERM; } else { /* If sdfat_mode_can_hold_ro(inode) is false, can't change w bits. */ if ((perm & S_IWUGO) != (S_IWUGO & ~mask)) return -EPERM; } *mode_ptr &= S_IFMT | perm; return 0; } static int sdfat_setattr(struct dentry *dentry, struct iattr *attr) { struct sdfat_sb_info *sbi = SDFAT_SB(dentry->d_sb); struct inode *inode = dentry->d_inode; unsigned int ia_valid; int error; loff_t old_size; TMSG("%s entered\n", __func__); if ((attr->ia_valid & ATTR_SIZE) && (attr->ia_size > i_size_read(inode))) { error = sdfat_cont_expand(inode, attr->ia_size); if (error || attr->ia_valid == ATTR_SIZE) return error; attr->ia_valid &= ~ATTR_SIZE; } ia_valid = attr->ia_valid; if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) && sdfat_allow_set_time(sbi, inode)) { attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET); } error = inode_change_ok(inode, attr); attr->ia_valid = ia_valid; if (error) { return error; } if (((attr->ia_valid & ATTR_UID) && (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) || ((attr->ia_valid & ATTR_GID) && (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) || ((attr->ia_valid & ATTR_MODE) && (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | S_IRWXUGO)))) { return -EPERM; } /* * We don't return -EPERM here. Yes, strange, but this is too * old behavior. */ if (attr->ia_valid & ATTR_MODE) { if (sdfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0) attr->ia_valid &= ~ATTR_MODE; } SDFAT_I(inode)->fid.size = i_size_read(inode); /* patch 1.2.0 : fixed the problem of size mismatch. */ if (attr->ia_valid & ATTR_SIZE) { old_size = i_size_read(inode); /* TO CHECK evicting directory works correctly */ MMSG("%s: inode(%p) truncate size (%llu->%llu)\n", __func__, inode, (u64)old_size, (u64)attr->ia_size); __sdfat_do_truncate(inode, old_size, attr->ia_size); } setattr_copy(inode, attr); mark_inode_dirty(inode); TMSG("%s exited with err(%d)\n", __func__, error); return error; } static int sdfat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { struct inode *inode = dentry->d_inode; TMSG("%s entered\n", __func__); generic_fillattr(inode, stat); stat->blksize = SDFAT_SB(inode->i_sb)->fsi.cluster_size; TMSG("%s exited\n", __func__); return 0; } static const struct inode_operations sdfat_dir_inode_operations = { .create = sdfat_create, .lookup = sdfat_lookup, .unlink = sdfat_unlink, .symlink = sdfat_symlink, .mkdir = sdfat_mkdir, .rmdir = sdfat_rmdir, .rename = sdfat_rename, .setattr = sdfat_setattr, .getattr = sdfat_getattr, #ifdef CONFIG_SDFAT_VIRTUAL_XATTR .setxattr = sdfat_setxattr, .getxattr = sdfat_getxattr, .listxattr = sdfat_listxattr, .removexattr = sdfat_removexattr, #endif }; /*======================================================================*/ /* File Operations */ /*======================================================================*/ static const struct inode_operations sdfat_symlink_inode_operations = { .readlink = generic_readlink, .follow_link = sdfat_follow_link, #ifdef CONFIG_SDFAT_VIRTUAL_XATTR .setxattr = sdfat_setxattr, .getxattr = sdfat_getxattr, .listxattr = sdfat_listxattr, .removexattr = sdfat_removexattr, #endif }; static int sdfat_file_release(struct inode *inode, struct file *filp) { struct super_block *sb = inode->i_sb; /* Moved below code from sdfat_write_inode * TO FIX size-mismatch problem. */ /* FIXME : Added bug_on to confirm that there is no size mismatch */ sdfat_debug_bug_on(SDFAT_I(inode)->fid.size != i_size_read(inode)); SDFAT_I(inode)->fid.size = i_size_read(inode); fsapi_sync_fs(sb, 0); return 0; } static const struct file_operations sdfat_file_operations = { .llseek = generic_file_llseek, #if LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0) .read_iter = generic_file_read_iter, .write_iter = generic_file_write_iter, #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) .read = new_sync_read, .write = new_sync_write, .read_iter = generic_file_read_iter, .write_iter = generic_file_write_iter, #else .read = do_sync_read, .write = do_sync_write, .aio_read = generic_file_aio_read, .aio_write = generic_file_aio_write, #endif .mmap = sdfat_file_mmap, .release = sdfat_file_release, .unlocked_ioctl = sdfat_generic_ioctl, .fsync = sdfat_file_fsync, .splice_read = generic_file_splice_read, }; static const struct address_space_operations sdfat_da_aops; static const struct address_space_operations sdfat_aops; static void sdfat_truncate(struct inode *inode, loff_t old_size) { struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); FS_INFO_T *fsi = &(sbi->fsi); unsigned int blocksize = 1 << inode->i_blkbits; loff_t aligned_size; int err; __lock_super(sb); if (SDFAT_I(inode)->fid.start_clu == 0) { /* ?! Stange statement Empty start_clu != ~0 (not allocated) */ /* FIXME:fata error? */ sdfat_fs_error(sb, "tried to truncate zeroed cluster."); goto out; } sdfat_debug_check_clusters(inode); __cancel_dfr_work(inode, (loff_t)i_size_read(inode), (loff_t)old_size, __func__); err = fsapi_truncate(inode, old_size, i_size_read(inode)); if (err) goto out; inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; if (IS_DIRSYNC(inode)) (void) sdfat_sync_inode(inode); else mark_inode_dirty(inode); // FIXME: 확인 요망 // inode->i_blocks = ((SDFAT_I(inode)->i_size_ondisk + (fsi->cluster_size - 1)) inode->i_blocks = ( (i_size_read(inode) + (fsi->cluster_size - 1)) & ~((loff_t)fsi->cluster_size - 1) ) >> inode->i_blkbits; out: /* * This protects against truncating a file bigger than it was then * trying to write into the hole. * * comment by sh.hong: * This seems to mean 'intra page/block' truncate and writing. * I couldn't find a reason to change the values prior to fsapi_truncate * Therefore, I switched the order of operations * so that it's possible to utilize i_size_ondisk in fsapi_truncate */ aligned_size = i_size_read(inode); if (aligned_size & (blocksize - 1)) { aligned_size |= (blocksize - 1); aligned_size++; } if (SDFAT_I(inode)->i_size_ondisk > i_size_read(inode)) { SDFAT_I(inode)->i_size_ondisk = aligned_size; } sdfat_debug_check_clusters(inode); if (SDFAT_I(inode)->i_size_aligned > i_size_read(inode)) SDFAT_I(inode)->i_size_aligned = aligned_size; /* After truncation : * 1) Delayed allocation is OFF * i_size = i_size_ondisk <= i_size_aligned * (useless size var.) * (block-aligned) * 2) Delayed allocation is ON * i_size = i_size_ondisk = i_size_aligned * (will be block-aligned after write) * or * i_size_ondisk < i_size <= i_size_aligned (block_aligned) * (will be block-aligned after write) */ __unlock_super(sb); } static const struct inode_operations sdfat_file_inode_operations = { .setattr = sdfat_setattr, .getattr = sdfat_getattr, #ifdef CONFIG_SDFAT_VIRTUAL_XATTR .setxattr = sdfat_setxattr, .getxattr = sdfat_getxattr, .listxattr = sdfat_listxattr, .removexattr = sdfat_removexattr, #endif }; /*======================================================================*/ /* Address Space Operations */ /*======================================================================*/ /* 2-level option flag */ #define BMAP_NOT_CREATE 0 #define BMAP_ADD_BLOCK 1 #define BMAP_ADD_CLUSTER 2 #define BLOCK_ADDED(bmap_ops) (bmap_ops) static int sdfat_bmap(struct inode *inode, sector_t sector, sector_t *phys, unsigned long *mapped_blocks, int *create) { struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); FS_INFO_T *fsi = &(sbi->fsi); const unsigned long blocksize = sb->s_blocksize; const unsigned char blocksize_bits = sb->s_blocksize_bits; sector_t last_block; unsigned int cluster, clu_offset, sec_offset; int err = 0; *phys = 0; *mapped_blocks = 0; /* core code should handle EIO */ /* if(fsi->prev_eio && BLOCK_ADDED(*create)) return -EIO; */ if ( ((fsi->vol_type == FAT12) || (fsi->vol_type == FAT16)) && (inode->i_ino == SDFAT_ROOT_INO) ) { if (sector < (fsi->dentries_in_root >> (sb->s_blocksize_bits-DENTRY_SIZE_BITS)) ) { *phys = sector + fsi->root_start_sector; *mapped_blocks = 1; } return 0; } last_block = (i_size_read(inode) + (blocksize - 1)) >> blocksize_bits; if ((sector >= last_block) && (*create == BMAP_NOT_CREATE)) return 0; /* Is this block already allocated? */ clu_offset = sector >> fsi->sect_per_clus_bits; /* cluster offset */ SDFAT_I(inode)->fid.size = i_size_read(inode); if ( unlikely(__check_dfr_on(inode, (loff_t)((loff_t)clu_offset << fsi->cluster_size_bits), (loff_t)((loff_t)(clu_offset + 1) << fsi->cluster_size_bits), __func__)) ) { err = __do_dfr_map_cluster(inode, clu_offset, &cluster); } else { if (*create & BMAP_ADD_CLUSTER) err = fsapi_map_clus(inode, clu_offset, &cluster, 1); else err = fsapi_map_clus(inode, clu_offset, &cluster, ALLOC_NOWHERE); } if (err) { if (err != -ENOSPC) return -EIO; return err; } if (!IS_CLUS_EOF(cluster)) { /* sector offset in cluster */ sec_offset = sector & (fsi->sect_per_clus - 1); *phys = CLUS_TO_SECT(fsi, cluster) + sec_offset; *mapped_blocks = fsi->sect_per_clus - sec_offset; } #if 0 else { /* Debug purpose (new clu needed) */ ASSERT((*create & BMAP_ADD_CLUSTER) == 0); ASSERT(sector >= last_block); } #endif if (sector < last_block) *create = BMAP_NOT_CREATE; /* else if (sector >= last_block) *create = non-zero; */ /* if (iblock <= last mapped-block) *phys != 0 *create = BMAP_NOT_CREATE else if (iblock <= last cluster) *phys != 0 *create = non-zero */ return 0; } static int sdfat_da_prep_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) { struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); FS_INFO_T *fsi = &(sbi->fsi); unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; unsigned long mapped_blocks; sector_t phys; loff_t pos; int sec_offset; int bmap_create = create ? BMAP_ADD_BLOCK : BMAP_NOT_CREATE; int err = 0; __lock_super(sb); /* FAT32 only */ ASSERT(fsi->vol_type == FAT32); err = sdfat_bmap(inode, iblock, &phys, &mapped_blocks, &bmap_create); if (err) { if (err != -ENOSPC) sdfat_fs_error_ratelimit(sb, "%s: failed to bmap " "(iblock:%u, err:%d)", __func__, (u32)iblock, err); goto unlock_ret; } sec_offset = iblock & (fsi->sect_per_clus - 1); if (phys) { /* the block in in the mapped cluster boundary */ max_blocks = min(mapped_blocks, max_blocks); map_bh(bh_result, sb, phys); BUG_ON(BLOCK_ADDED(bmap_create) && (sec_offset == 0)); } else if (create == 1) { /* Not exist: new cluster needed */ BUG_ON(!BLOCK_ADDED(bmap_create)); // Reserved Cluster (only if iblock is the first sector in a clu) if (sec_offset == 0) { err = fsapi_reserve_clus(inode); if (err) { if (err != -ENOSPC) sdfat_fs_error_ratelimit(sb, "%s: failed to bmap " "(iblock:%u, err:%d)", __func__, (u32)iblock, err); goto unlock_ret; } } // Delayed mapping map_bh(bh_result, sb, ~((sector_t) 0xffff)); set_buffer_new(bh_result); set_buffer_delay(bh_result); } else { /* get_block on non-existing addr. with create==0 */ /* * CHECKME: * i_size_aligned 보다 작으면 delay 매핑을 일단 * 켜줘야되는 게 아닌가? * - 0-fill 을 항상 하기에, FAT 에서는 문제 없음. * 중간에 영역이 꽉 찼으면, 디스크에 내려가지 않고는 * invalidate 될 일이 없음 */ goto unlock_ret; } /* Newly added blocks */ if (BLOCK_ADDED(bmap_create)) { set_buffer_new(bh_result); SDFAT_I(inode)->i_size_aligned += max_blocks << sb->s_blocksize_bits; if (phys) { /* i_size_ondisk changes if a block added in the existing cluster */ #define num_clusters(value) ((value) ? (s32)((value - 1) >> fsi->cluster_size_bits) + 1 : 0) /* FOR GRACEFUL ERROR HANDLING */ if (num_clusters(SDFAT_I(inode)->i_size_aligned) != num_clusters(SDFAT_I(inode)->i_size_ondisk)) { EMSG("%s: inode(%p) invalid size (create(%d) " "bmap_create(%d) phys(%lld) aligned(%lld) " "on_disk(%lld) iblock(%u) sec_off(%d))\n", __func__, inode, create, bmap_create, (s64)phys, (s64)SDFAT_I(inode)->i_size_aligned, (s64)SDFAT_I(inode)->i_size_ondisk, (u32)iblock, (s32)sec_offset); sdfat_debug_bug_on(1); } SDFAT_I(inode)->i_size_ondisk = SDFAT_I(inode)->i_size_aligned; } pos = (iblock + 1) << sb->s_blocksize_bits; /* Debug purpose - defensive coding */ ASSERT(SDFAT_I(inode)->i_size_aligned == pos); if (SDFAT_I(inode)->i_size_aligned < pos) SDFAT_I(inode)->i_size_aligned = pos; /* Debug end */ #ifdef CONFIG_SDFAT_TRACE_IO /* New page added (ASSERTION: 8 blocks per page) */ if ((sec_offset & 7) == 0) sbi->stat_n_pages_added++; #endif } /* FOR GRACEFUL ERROR HANDLING */ if (i_size_read(inode) > SDFAT_I(inode)->i_size_aligned) { sdfat_fs_error_ratelimit(sb, "%s: invalid size (inode(%p), " "size(%llu) > aligned(%llu)\n", __func__, inode, i_size_read(inode), SDFAT_I(inode)->i_size_aligned); sdfat_debug_bug_on(1); } bh_result->b_size = max_blocks << sb->s_blocksize_bits; unlock_ret: __unlock_super(sb); return err; } static int sdfat_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) { struct super_block *sb = inode->i_sb; unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; int err = 0; unsigned long mapped_blocks; sector_t phys; loff_t pos; int bmap_create = create ? BMAP_ADD_CLUSTER : BMAP_NOT_CREATE; __lock_super(sb); err = sdfat_bmap(inode, iblock, &phys, &mapped_blocks, &bmap_create); if (err) { if (err != -ENOSPC) sdfat_fs_error_ratelimit(sb, "%s: failed to bmap " "(inode:%p iblock:%u, err:%d)", __func__, inode, (u32)iblock, err); goto unlock_ret; } if (phys) { max_blocks = min(mapped_blocks, max_blocks); /* Treat newly added block / cluster */ if (BLOCK_ADDED(bmap_create) || buffer_delay(bh_result)) { /* Update i_size_ondisk */ pos = (iblock + 1) << sb->s_blocksize_bits; if (SDFAT_I(inode)->i_size_ondisk < pos) { /* Debug purpose */ if ((pos - SDFAT_I(inode)->i_size_ondisk) > bh_result->b_size) { /* This never happens without DA */ MMSG("Jumping get_block\n"); } SDFAT_I(inode)->i_size_ondisk = pos; sdfat_debug_check_clusters(inode); } if (BLOCK_ADDED(bmap_create)) { /* Old way (w/o DA) * create == 1 only if iblock > i_size * (in block unit) */ /* 20130723 CHECK * Truncate와 동시에 발생할 경우, * i_size < (i_block 위치) 면서 buffer_delay()가 * 켜져있을 수 있다. * * 기존에 할당된 영역을 다시 쓸 뿐이므로 큰 문제 * 없지만, 그 경우, 미리 i_size_algined 가 확장된 * 영역이어야 한다. */ /* FOR GRACEFUL ERROR HANDLING : * * sdfat_debug_bug_on(buffer_delay(bh_result) && (pos > SDFAT_I(inode)->i_size_aligned)); */ if (buffer_delay(bh_result) && (pos > SDFAT_I(inode)->i_size_aligned)) { sdfat_fs_error(sb, "requested for bmap out of range(pos:(%llu)>i_size_aligned(%llu)\n", pos, SDFAT_I(inode)->i_size_aligned); sdfat_debug_bug_on(1); err = -EIO; goto unlock_ret; } set_buffer_new(bh_result); /* i_size_ondisk 이 i_size_aligned 보다 먼저 * 움직인 경우, (예: non-DA 상황) * 두 변수 사이의 관계 유지 */ if (SDFAT_I(inode)->i_size_ondisk > SDFAT_I(inode)->i_size_aligned) { SDFAT_I(inode)->i_size_aligned = SDFAT_I(inode)->i_size_ondisk; } } if (buffer_delay(bh_result)) clear_buffer_delay(bh_result); #if 0 /* Debug purpose */ if (SDFAT_I(inode)->i_size_ondisk > SDFAT_I(inode)->i_size_aligned ) { /* Only after truncate * and the two size variables should indicate * same i_block */ unsigned int blocksize = 1 << inode->i_blkbits; BUG_ON(SDFAT_I(inode)->i_size_ondisk - SDFAT_I(inode)->i_size_aligned >= blocksize); } #endif } map_bh(bh_result, sb, phys); } bh_result->b_size = max_blocks << sb->s_blocksize_bits; unlock_ret: __unlock_super(sb); return err; } static int sdfat_readpage(struct file *file, struct page *page) { int ret; ret = mpage_readpage(page, sdfat_get_block); return ret; } static int sdfat_readpages(struct file *file, struct address_space *mapping, struct list_head *pages, unsigned nr_pages) { int ret; ret = mpage_readpages(mapping, pages, nr_pages, sdfat_get_block); return ret; } static inline void sdfat_submit_fullpage_bio(struct block_device *bdev, sector_t sector, unsigned int length, struct page *page) { /* Single page bio submit */ struct bio *bio; BUG_ON((length > PAGE_CACHE_SIZE) || (length == 0)); /* * If __GFP_WAIT is set, then bio_alloc will always be able to allocate * a bio. This is due to the mempool guarantees. To make this work, callers * must never allocate more than 1 bio at a time from this pool. * * #define GFP_NOIO (__GFP_WAIT) */ bio = bio_alloc(GFP_NOIO, 1); bio->bi_bdev = bdev; bio->bi_vcnt = 1; bio->bi_io_vec[0].bv_page = page; /* Inline vec */ bio->bi_io_vec[0].bv_len = length; //PAGE_CACHE_SIZE; bio->bi_io_vec[0].bv_offset = 0; __sdfat_set_bio_iterate(bio, sector, length, 0, 0); bio->bi_end_io = sdfat_writepage_end_io; submit_bio(WRITE, bio); } static int sdfat_writepage(struct page *page, struct writeback_control *wbc) { struct inode * const inode = page->mapping->host; struct super_block *sb = inode->i_sb; loff_t i_size = i_size_read(inode); const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; const unsigned int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits; FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi); struct buffer_head *bh, *head; sector_t block, block_0, last_phys; int ret; unsigned int nr_blocks_towrite = blocks_per_page; /* Don't distinguish 0-filled/clean block. * Just write back the whole page */ if (fsi->cluster_size < PAGE_CACHE_SIZE) goto confused; if (!PageUptodate(page)){ MMSG("%s: Not up-to-date page -> block_write_full_page\n", __func__); goto confused; } if (page->index >= end_index) { /* last page or outside i_size */ unsigned offset = i_size & (PAGE_CACHE_SIZE-1); /* If a truncation is in progress */ if (page->index > end_index || !offset) goto confused; /* 0-fill after i_size */ zero_user_segment(page, offset, PAGE_CACHE_SIZE); } if (!page_has_buffers(page)){ MMSG("WP: No buffers -> block_write_full_page\n"); goto confused; } block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); block_0 = block; // first block head = page_buffers(page); bh = head; last_phys = 0; do { BUG_ON(buffer_locked(bh)); if (!buffer_dirty(bh) || !buffer_uptodate(bh)) { if (nr_blocks_towrite == blocks_per_page) nr_blocks_towrite = (unsigned int) (block - block_0); BUG_ON(nr_blocks_towrite >= blocks_per_page); // !uptodate but dirty?? if (buffer_dirty(bh)) goto confused; // Nothing to writeback in this block bh = bh->b_this_page; block++; continue; } if (nr_blocks_towrite != blocks_per_page) // Dirty -> Non-dirty -> Dirty again case goto confused; /* Map if needed */ if (!buffer_mapped(bh) || buffer_delay(bh)) { BUG_ON(bh->b_size != (1 << (inode->i_blkbits))); ret = sdfat_get_block(inode, block, bh, 1); if (ret) { goto confused; } if (buffer_new(bh)) { clear_buffer_new(bh); unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); } } /* continuity check */ if (((last_phys + 1) != bh->b_blocknr) && (last_phys != 0)) { DMSG("Non-contiguous block mapping in single page"); goto confused; } last_phys = bh->b_blocknr; bh = bh->b_this_page; block++; } while (bh != head); if (nr_blocks_towrite == 0) { DMSG("Page dirty but no dirty bh? alloc_208\n"); goto confused; } /* Write-back */ do { clear_buffer_dirty(bh); bh = bh->b_this_page; }while (bh != head); BUG_ON(PageWriteback(page)); set_page_writeback(page); /** * Turn off MAPPED flag in victim's bh if defrag on. * Another write_begin can starts after get_block for defrag victims called. * In this case, write_begin calls get_block and get original block number * and previous defrag will be canceled. */ if ( unlikely(__check_dfr_on(inode, (loff_t)(page->index << PAGE_SHIFT), (loff_t)((page->index + 1) << PAGE_SHIFT), __func__)) ) { do { clear_buffer_mapped(bh); bh = bh->b_this_page; } while (bh != head); } // Trace # of pages queued (Approx.) atomic_inc(&SDFAT_SB(sb)->stat_n_pages_queued); sdfat_submit_fullpage_bio(head->b_bdev, head->b_blocknr << (inode->i_blkbits - sb->s_blocksize_bits), nr_blocks_towrite << inode->i_blkbits, page); unlock_page(page); return 0; confused: #ifdef CONFIG_SDFAT_TRACE_IO SDFAT_SB(sb)->stat_n_pages_confused++; #endif ret = block_write_full_page(page, sdfat_get_block, wbc); return ret; } static int sdfat_da_writepages(struct address_space *mapping, struct writeback_control *wbc) { MMSG("%s(inode:%p) with nr_to_write = 0x%08lx " "(ku %d, bg %d, tag %d, rc %d )\n", __func__, mapping->host, wbc->nr_to_write, wbc->for_kupdate, wbc->for_background, wbc->tagged_writepages, wbc->for_reclaim); ASSERT(mapping->a_ops == &sdfat_da_aops); #ifdef CONFIG_SDFAT_ALIGNED_MPAGE_WRITE if (SDFAT_SB(mapping->host->i_sb)->options.adj_req) return sdfat_mpage_writepages(mapping, wbc, sdfat_get_block); #endif return generic_writepages(mapping, wbc); } static int sdfat_writepages(struct address_space *mapping, struct writeback_control *wbc) { MMSG("%s(inode:%p) with nr_to_write = 0x%08lx " "(ku %d, bg %d, tag %d, rc %d )\n", __func__, mapping->host, wbc->nr_to_write, wbc->for_kupdate, wbc->for_background, wbc->tagged_writepages, wbc->for_reclaim); ASSERT(mapping->a_ops == &sdfat_aops); #ifdef CONFIG_SDFAT_ALIGNED_MPAGE_WRITE if (SDFAT_SB(mapping->host->i_sb)->options.adj_req) return sdfat_mpage_writepages(mapping, wbc, sdfat_get_block); #endif return mpage_writepages(mapping, wbc, sdfat_get_block); } static void sdfat_write_failed(struct address_space *mapping, loff_t to) { struct inode *inode = mapping->host; if (to > i_size_read(inode)) { __sdfat_truncate_pagecache(inode, to, i_size_read(inode)); sdfat_truncate(inode, SDFAT_I(inode)->i_size_aligned); } } static int __sdfat_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata, get_block_t *get_block, loff_t *bytes, const char *fname) { int ret; __cancel_dfr_work(mapping->host, pos, (loff_t)(pos + len), fname); *pagep = NULL; ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, get_block, bytes); if (ret < 0) sdfat_write_failed(mapping, pos+len); return ret; } static int sdfat_da_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { return __sdfat_write_begin(file, mapping, pos, len, flags, pagep, fsdata, sdfat_da_prep_block, &SDFAT_I(mapping->host)->i_size_aligned, __func__); } static int sdfat_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { return __sdfat_write_begin(file, mapping, pos, len, flags, pagep, fsdata, sdfat_get_block, &SDFAT_I(mapping->host)->i_size_ondisk, __func__); } static int sdfat_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *pagep, void *fsdata) { struct inode *inode = mapping->host; FILE_ID_T *fid = &(SDFAT_I(inode)->fid); int err; err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); /* FOR GRACEFUL ERROR HANDLING */ if (SDFAT_I(inode)->i_size_aligned < i_size_read(inode)) { sdfat_fs_error(inode->i_sb, "invalid size(size(%llu) " "> aligned(%llu)\n", i_size_read(inode), SDFAT_I(inode)->i_size_aligned); sdfat_debug_bug_on(1); } if (err < len) sdfat_write_failed(mapping, pos+len); if (!(err < 0) && !(fid->attr & ATTR_ARCHIVE)) { inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; fid->attr |= ATTR_ARCHIVE; mark_inode_dirty(inode); } return err; } static inline ssize_t __sdfat_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, void *iov_u, loff_t offset, loff_t count) { struct address_space *mapping = inode->i_mapping; loff_t size = offset + count; ssize_t ret; if (rw == WRITE) { /* * FIXME: blockdev_direct_IO() doesn't use ->write_begin(), * so we need to update the ->i_size_aligned to block boundary. * * But we must fill the remaining area or hole by nul for * updating ->i_size_aligned * * Return 0, and fallback to normal buffered write. */ if (SDFAT_I(inode)->i_size_aligned < size) return 0; } /* * sdFAT need to use the DIO_LOCKING for avoiding the race * condition of sdfat_get_block() and ->truncate(). */ ret = __sdfat_blkdev_direct_IO(rw, iocb, inode, iov_u, offset, 0); if (ret < 0 && (rw & WRITE)) sdfat_write_failed(mapping, size); return ret; } static const struct address_space_operations sdfat_aops = { .readpage = sdfat_readpage, .readpages = sdfat_readpages, .writepage = sdfat_writepage, .writepages = sdfat_writepages, .write_begin = sdfat_write_begin, .write_end = sdfat_write_end, .direct_IO = sdfat_direct_IO, .bmap = sdfat_aop_bmap }; static const struct address_space_operations sdfat_da_aops = { .readpage = sdfat_readpage, .readpages = sdfat_readpages, .writepage = sdfat_writepage, .writepages = sdfat_da_writepages, .write_begin = sdfat_da_write_begin, .write_end = sdfat_write_end, .direct_IO = sdfat_direct_IO, .bmap = sdfat_aop_bmap }; /*======================================================================*/ /* Super Operations */ /*======================================================================*/ static inline unsigned long sdfat_hash(loff_t i_pos) { return hash_32(i_pos, SDFAT_HASH_BITS); } static void sdfat_attach(struct inode *inode, loff_t i_pos) { struct sdfat_sb_info *sbi = SDFAT_SB(inode->i_sb); struct hlist_head *head = sbi->inode_hashtable + sdfat_hash(i_pos); spin_lock(&sbi->inode_hash_lock); SDFAT_I(inode)->i_pos = i_pos; hlist_add_head(&SDFAT_I(inode)->i_hash_fat, head); spin_unlock(&sbi->inode_hash_lock); } static void sdfat_detach(struct inode *inode) { struct sdfat_sb_info *sbi = SDFAT_SB(inode->i_sb); spin_lock(&sbi->inode_hash_lock); hlist_del_init(&SDFAT_I(inode)->i_hash_fat); SDFAT_I(inode)->i_pos = 0; spin_unlock(&sbi->inode_hash_lock); } /* doesn't deal with root inode */ static int sdfat_fill_inode(struct inode *inode, const FILE_ID_T *fid) { struct sdfat_sb_info *sbi = SDFAT_SB(inode->i_sb); FS_INFO_T *fsi = &(sbi->fsi); DIR_ENTRY_T info; u64 size = fid->size; memcpy(&(SDFAT_I(inode)->fid), fid, sizeof(FILE_ID_T)); SDFAT_I(inode)->i_pos = 0; SDFAT_I(inode)->target = NULL; inode->i_uid = sbi->options.fs_uid; inode->i_gid = sbi->options.fs_gid; inode->i_version++; inode->i_generation = get_seconds(); if (fsapi_read_inode(inode, &info) < 0) { MMSG("%s: failed to read stat!\n", __func__); return -EIO; } if (info.Attr & ATTR_SUBDIR) { /* directory */ inode->i_generation &= ~1; inode->i_mode = sdfat_make_mode(sbi, info.Attr, S_IRWXUGO); inode->i_op = &sdfat_dir_inode_operations; inode->i_fop = &sdfat_dir_operations; set_nlink(inode,info.NumSubdirs); } else if (info.Attr & ATTR_SYMLINK) { /* symbolic link */ inode->i_op = &sdfat_symlink_inode_operations; inode->i_generation |= 1; inode->i_mode = sdfat_make_mode(sbi, info.Attr, S_IRWXUGO); } else { /* regular file */ inode->i_generation |= 1; inode->i_mode = sdfat_make_mode(sbi, info.Attr, S_IRWXUGO); inode->i_op = &sdfat_file_inode_operations; inode->i_fop = &sdfat_file_operations; if (sbi->options.improved_allocation & SDFAT_ALLOC_DELAY) inode->i_mapping->a_ops = &sdfat_da_aops; else inode->i_mapping->a_ops = &sdfat_aops; inode->i_mapping->nrpages = 0; } /* * Use fid->size instead of info.Size * because info.Size means the value saved on disk */ i_size_write(inode, size); /* ondisk and aligned size should be aligned with block size */ if (size & (inode->i_sb->s_blocksize - 1)) { size |= (inode->i_sb->s_blocksize - 1); size++; } SDFAT_I(inode)->i_size_aligned = size; SDFAT_I(inode)->i_size_ondisk = size; sdfat_debug_check_clusters(inode); sdfat_save_attr(inode, info.Attr); inode->i_blocks = ( (i_size_read(inode) + (fsi->cluster_size - 1)) & ~((loff_t)fsi->cluster_size - 1) ) >> inode->i_blkbits; sdfat_time_fat2unix(sbi, &inode->i_mtime, &info.ModifyTimestamp); sdfat_time_fat2unix(sbi, &inode->i_ctime, &info.CreateTimestamp); sdfat_time_fat2unix(sbi, &inode->i_atime, &info.AccessTimestamp); __init_dfr_info(inode); return 0; } static struct inode *sdfat_build_inode(struct super_block *sb, const FILE_ID_T *fid, loff_t i_pos) { struct inode *inode; int err; inode = sdfat_iget(sb, i_pos); if (inode) goto out; inode = new_inode(sb); if (!inode) { inode = ERR_PTR(-ENOMEM); goto out; } inode->i_ino = iunique(sb, SDFAT_ROOT_INO); inode->i_version = 1; err = sdfat_fill_inode(inode, fid); if (err) { iput(inode); inode = ERR_PTR(err); goto out; } sdfat_attach(inode, i_pos); insert_inode_hash(inode); out: return inode; } static struct inode *sdfat_alloc_inode(struct super_block *sb) { struct sdfat_inode_info *ei; ei = kmem_cache_alloc(sdfat_inode_cachep, GFP_NOFS); if (!ei) return NULL; #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) init_rwsem(&ei->truncate_lock); #endif return &ei->vfs_inode; } static void sdfat_destroy_inode(struct inode *inode) { if (SDFAT_I(inode)->target) { kfree(SDFAT_I(inode)->target); SDFAT_I(inode)->target = NULL; } kmem_cache_free(sdfat_inode_cachep, SDFAT_I(inode)); } static int __sdfat_write_inode(struct inode *inode, int sync) { struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); DIR_ENTRY_T info; if (inode->i_ino == SDFAT_ROOT_INO) return 0; info.Attr = sdfat_make_attr(inode); info.Size = i_size_read(inode); sdfat_time_unix2fat(sbi, &inode->i_mtime, &info.ModifyTimestamp); sdfat_time_unix2fat(sbi, &inode->i_ctime, &info.CreateTimestamp); sdfat_time_unix2fat(sbi, &inode->i_atime, &info.AccessTimestamp); if (!__support_write_inode_sync(sb)) sync = 0; /* FIXME : Do we need handling error? */ return fsapi_write_inode(inode, &info, sync); } static int sdfat_sync_inode(struct inode *inode) { return __sdfat_write_inode(inode, 1); } static int sdfat_write_inode(struct inode *inode, struct writeback_control *wbc) { return __sdfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); } static void sdfat_evict_inode(struct inode *inode) { truncate_inode_pages(&inode->i_data, 0); if (!inode->i_nlink) { loff_t old_size = i_size_read(inode); i_size_write(inode, 0); SDFAT_I(inode)->fid.size = old_size; __cancel_dfr_work(inode, 0, (loff_t)old_size, __func__); /* TO CHECK evicting directory works correctly */ MMSG("%s: inode(%p) evict %s (size(%llu) to zero)\n", __func__, inode, S_ISDIR(inode->i_mode) ? "directory" : "file", (u64)old_size); fsapi_truncate(inode, old_size, 0); } invalidate_inode_buffers(inode); clear_inode(inode); fsapi_invalidate_extent(inode); sdfat_detach(inode); /* after end of this function, caller will remove inode hash */ /* remove_inode_hash(inode); */ } static void sdfat_put_super(struct super_block *sb) { struct sdfat_sb_info *sbi = SDFAT_SB(sb); int err; sdfat_log_msg(sb, KERN_INFO, "trying to unmount..."); __cancel_delayed_work_sync(sbi); if (__is_sb_dirty(sb)) sdfat_write_super(sb); __free_dfr_mem_if_required(sb); err = fsapi_umount(sb); if (sbi->nls_disk) { unload_nls(sbi->nls_disk); sbi->nls_disk = NULL; sbi->options.codepage = sdfat_default_codepage; } if (sbi->nls_io) { unload_nls(sbi->nls_io); sbi->nls_io = NULL; } if (sbi->options.iocharset != sdfat_default_iocharset) { kfree(sbi->options.iocharset); sbi->options.iocharset = sdfat_default_iocharset; } sb->s_fs_info = NULL; kobject_del(&sbi->sb_kobj); kobject_put(&sbi->sb_kobj); if (!sbi->use_vmalloc) kfree(sbi); else vfree(sbi); sdfat_log_msg(sb, KERN_INFO, "unmounted successfully! %s", err ? "(with previous I/O errors)" : ""); } static inline void __flush_delayed_meta(struct super_block *sb, s32 sync) { #ifdef CONFIG_SDFAT_DELAYED_META_DIRTY fsapi_cache_flush(sb, sync); #else /* DO NOTHING */ #endif } static void sdfat_write_super(struct super_block *sb) { int time = 0; __lock_super(sb); __set_sb_clean(sb); #ifdef CONFIG_SDFAT_DFR if (atomic_read(&(SDFAT_SB(sb)->dfr_info.stat)) == DFR_SB_STAT_VALID) { fsapi_dfr_update_fat_next(sb); } #endif /* flush delayed FAT/DIR dirty */ __flush_delayed_meta(sb, 0); if (!(sb->s_flags & MS_RDONLY)) fsapi_sync_fs(sb, 0); __unlock_super(sb); time = jiffies; /* Issuing bdev requests is needed to guarantee DIR updates in time whether w/ or w/o delayed DIR dirty feature. (otherwise DIR updates could be delayed for 5 + 5 secs at max.) */ sync_blockdev(sb->s_bdev); #if (defined(CONFIG_SDFAT_DFR) && defined(CONFIG_SDFAT_DFR_DEBUG)) /* SPO test */ fsapi_dfr_spo_test(sb, DFR_SPO_FAT_NEXT, __func__); #endif MMSG("BD: sdfat_write_super (bdev_sync for %ld ms)\n", (jiffies - time) * 1000 / HZ); } static void __dfr_update_fat_next(struct super_block *sb) { #ifdef CONFIG_SDFAT_DFR struct sdfat_sb_info *sbi = SDFAT_SB(sb); if ( sbi->options.defrag && (atomic_read(&sbi->dfr_info.stat) == DFR_SB_STAT_VALID) ) { fsapi_dfr_update_fat_next(sb); } #endif } static void __dfr_update_fat_prev(struct super_block *sb, int wait) { #ifdef CONFIG_SDFAT_DFR struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct defrag_info *sb_dfr = &sbi->dfr_info; /* static time available? */ static int time= 0; int uevent = 0, total = 0, clean = 0, full = 0; int spent = jiffies - time; if ( !(sbi->options.defrag && wait) ) return; __lock_super(sb); /* Update FAT for defrag */ if (atomic_read(&(sbi->dfr_info.stat)) == DFR_SB_STAT_VALID) { fsapi_dfr_update_fat_prev(sb, 0); /* flush delayed FAT/DIR dirty */ __flush_delayed_meta(sb, 0); /* Complete defrag req */ fsapi_sync_fs(sb, 1); atomic_set(&sb_dfr->stat, DFR_SB_STAT_REQ); complete_all(&sbi->dfr_complete); } else if ( ((spent < 0) || (spent > DFR_DEFAULT_TIMEOUT)) && (atomic_read(&(sbi->dfr_info.stat)) == DFR_SB_STAT_IDLE) ) { uevent = fsapi_dfr_check_dfr_required(sb, &total, &clean, &full); time = jiffies; } __unlock_super(sb); if (uevent) { kobject_uevent(&SDFAT_SB(sb)->sb_kobj, KOBJ_CHANGE); dfr_debug("uevent for defrag_daemon, total_au %d, " "clean_au %d, full_au %d", total, clean, full); } #endif } static int sdfat_sync_fs(struct super_block *sb, int wait) { int err = 0; /* If there are some dirty buffers in the bdev inode */ if (__is_sb_dirty(sb)) { __lock_super(sb); __set_sb_clean(sb); __dfr_update_fat_next(sb); err = fsapi_sync_fs(sb, 1); #if (defined(CONFIG_SDFAT_DFR) && defined(CONFIG_SDFAT_DFR_DEBUG)) /* SPO test */ fsapi_dfr_spo_test(sb, DFR_SPO_FAT_NEXT, __func__); #endif __unlock_super(sb); } __dfr_update_fat_prev(sb, wait); return err; } static int sdfat_statfs(struct dentry *dentry, struct kstatfs *buf) { /* * patch 1.2.2 : * fixed the slow-call problem because of volume-lock contention. */ struct super_block *sb = dentry->d_sb; u64 id = huge_encode_dev(sb->s_bdev->bd_dev); FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi); VOL_INFO_T info; /* fsapi_statfs will try to get a volume lock if needed */ if (fsapi_statfs(sb, &info)) return -EIO; if (fsi->prev_eio) sdfat_msg(sb, KERN_INFO, "called statfs with previous" " I/O error(0x%02X).", fsi->prev_eio); buf->f_type = sb->s_magic; buf->f_bsize = info.ClusterSize; buf->f_blocks = info.NumClusters; buf->f_bfree = info.FreeClusters; buf->f_bavail = info.FreeClusters; buf->f_fsid.val[0] = (u32)id; buf->f_fsid.val[1] = (u32)(id >> 32); buf->f_namelen = 260; return 0; } static int sdfat_remount(struct super_block *sb, int *flags, char *data) { unsigned long prev_sb_flags; char *orig_data = kstrdup(data, GFP_KERNEL); struct sdfat_sb_info *sbi = SDFAT_SB(sb); FS_INFO_T *fsi = &(sbi->fsi); *flags |= MS_NODIRATIME; prev_sb_flags = sb->s_flags; sdfat_remount_syncfs(sb); fsapi_set_vol_flags(sb, VOL_CLEAN, 1); sdfat_log_msg(sb, KERN_INFO, "re-mounted(%s->%s), eio=0x%x, Opts: %s", (prev_sb_flags & MS_RDONLY) ? "ro" : "rw", (*flags & MS_RDONLY) ? "ro" : "rw", fsi->prev_eio, orig_data); kfree(orig_data); return 0; } static int __sdfat_show_options(struct seq_file *m, struct super_block *sb) { struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct sdfat_mount_options *opts = &sbi->options; FS_INFO_T *fsi = &(sbi->fsi); /* Show partition info */ seq_printf(m, ",fs=%s", sdfat_get_vol_type_str(fsi->vol_type)); if (fsi->prev_eio) seq_printf(m, ",eio=0x%x", fsi->prev_eio); if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID)) seq_printf(m, ",uid=%u", from_kuid_munged(&init_user_ns, opts->fs_uid)); if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID)) seq_printf(m, ",gid=%u", from_kgid_munged(&init_user_ns, opts->fs_gid)); seq_printf(m, ",fmask=%04o", opts->fs_fmask); seq_printf(m, ",dmask=%04o", opts->fs_dmask); if (opts->allow_utime) seq_printf(m, ",allow_utime=%04o", opts->allow_utime); if (sbi->nls_disk) seq_printf(m, ",codepage=%s", sbi->nls_disk->charset); if (sbi->nls_io) seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); if (opts->utf8) seq_puts(m, ",utf8"); if (sbi->fsi.vol_type != EXFAT) seq_puts(m, ",shortname=winnt"); seq_printf(m, ",namecase=%u", opts->casesensitive); if (opts->tz_utc) seq_puts(m, ",tz=UTC"); if (opts->improved_allocation & SDFAT_ALLOC_DELAY) seq_puts(m, ",delay"); if (opts->improved_allocation & SDFAT_ALLOC_SMART) seq_printf(m, ",smart,ausize=%u",\ opts->amap_opt.sect_per_au); if (opts->defrag) seq_puts(m, ",defrag"); if (opts->adj_hidsect) seq_puts(m, ",adj_hid"); if (opts->adj_req) seq_puts(m, ",adj_req"); seq_printf(m, ",symlink=%u", opts->symlink); seq_printf(m, ",bps=%ld", sb->s_blocksize); if (opts->errors == SDFAT_ERRORS_CONT) seq_puts(m, ",errors=continue"); else if (opts->errors == SDFAT_ERRORS_PANIC) seq_puts(m, ",errors=panic"); else seq_puts(m, ",errors=remount-ro"); if (opts->discard) seq_printf(m, ",discard"); return 0; } static const struct super_operations sdfat_sops = { .alloc_inode = sdfat_alloc_inode, .destroy_inode = sdfat_destroy_inode, .write_inode = sdfat_write_inode, .evict_inode = sdfat_evict_inode, .put_super = sdfat_put_super, #if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,00) .write_super = sdfat_write_super, #endif .sync_fs = sdfat_sync_fs, .statfs = sdfat_statfs, .remount_fs = sdfat_remount, .show_options = sdfat_show_options, }; /*======================================================================*/ /* SYSFS Operations */ /*======================================================================*/ #define SDFAT_ATTR(name, mode, show, store) \ static struct sdfat_attr sdfat_attr_##name = __ATTR(name, mode, show, store) struct sdfat_attr { struct attribute attr; ssize_t (*show)(struct sdfat_sb_info *, char *); ssize_t (*store)(struct sdfat_sb_info *, const char *, size_t); }; static ssize_t sdfat_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct sdfat_sb_info *sbi = container_of(kobj, struct sdfat_sb_info, sb_kobj); struct sdfat_attr *a = container_of(attr, struct sdfat_attr, attr); return a->show ? a->show(sbi, buf) : 0; } static ssize_t sdfat_attr_store(struct kobject *kobj, struct attribute *attr, const char *buf, size_t len) { struct sdfat_sb_info *sbi = container_of(kobj, struct sdfat_sb_info, sb_kobj); struct sdfat_attr *a = container_of(attr, struct sdfat_attr, attr); return a->store ? a->store(sbi, buf, len) : len; } static const struct sysfs_ops sdfat_attr_ops = { .show = sdfat_attr_show, .store = sdfat_attr_store, }; static ssize_t type_show(struct sdfat_sb_info *sbi, char *buf) { FS_INFO_T *fsi = &(sbi->fsi); return snprintf(buf, PAGE_SIZE, "%s\n", sdfat_get_vol_type_str(fsi->vol_type)); } SDFAT_ATTR(type, 0444, type_show, NULL); static ssize_t eio_show(struct sdfat_sb_info *sbi, char *buf) { FS_INFO_T *fsi = &(sbi->fsi); return snprintf(buf, PAGE_SIZE, "0x%x\n", fsi->prev_eio); } SDFAT_ATTR(eio, 0444, eio_show, NULL); static ssize_t fratio_show(struct sdfat_sb_info *sbi, char *buf) { unsigned int n_total_au = 0; unsigned int n_clean_au = 0; unsigned int n_full_au = 0; unsigned int n_dirty_au = 0; unsigned int fr = 0; n_total_au = fsapi_get_au_stat(sbi->host_sb, VOL_AU_STAT_TOTAL); n_clean_au = fsapi_get_au_stat(sbi->host_sb, VOL_AU_STAT_CLEAN); n_full_au = fsapi_get_au_stat(sbi->host_sb, VOL_AU_STAT_FULL); n_dirty_au = n_total_au - (n_full_au + n_clean_au); if (!n_dirty_au) fr = 0; else if(!n_clean_au) fr = 100; else fr = (n_dirty_au * 100) / (n_clean_au + n_dirty_au); return snprintf(buf, PAGE_SIZE, "%u\n", fr); } SDFAT_ATTR(fratio, 0444, fratio_show, NULL); static ssize_t totalau_show(struct sdfat_sb_info *sbi, char *buf) { unsigned int n_au = 0; n_au = fsapi_get_au_stat(sbi->host_sb, VOL_AU_STAT_TOTAL); return snprintf(buf, PAGE_SIZE, "%u\n", n_au); } SDFAT_ATTR(totalau, 0444, totalau_show, NULL); static ssize_t cleanau_show(struct sdfat_sb_info *sbi, char *buf) { unsigned int n_clean_au = 0; n_clean_au = fsapi_get_au_stat(sbi->host_sb, VOL_AU_STAT_CLEAN); return snprintf(buf, PAGE_SIZE, "%u\n", n_clean_au); } SDFAT_ATTR(cleanau, 0444, cleanau_show, NULL); static ssize_t fullau_show(struct sdfat_sb_info *sbi, char *buf) { unsigned int n_full_au = 0; n_full_au = fsapi_get_au_stat(sbi->host_sb, VOL_AU_STAT_FULL); return snprintf(buf, PAGE_SIZE, "%u\n", n_full_au); } SDFAT_ATTR(fullau, 0444, fullau_show, NULL); static struct attribute *sdfat_attrs[] = { &sdfat_attr_type.attr, &sdfat_attr_eio.attr, &sdfat_attr_fratio.attr, &sdfat_attr_totalau.attr, &sdfat_attr_cleanau.attr, &sdfat_attr_fullau.attr, NULL, }; static struct kobj_type sdfat_ktype = { .default_attrs = sdfat_attrs, .sysfs_ops = &sdfat_attr_ops, }; static ssize_t version_show(struct kobject *kobj, struct kobj_attribute *attr, char *buff) { return snprintf(buff, PAGE_SIZE, "FS Version %s\n", SDFAT_VERSION); } static struct kobj_attribute version_attr = __ATTR_RO(version); static struct attribute *attributes[] = { &version_attr.attr, NULL, }; static struct attribute_group attr_group = { .attrs = attributes, }; /*======================================================================*/ /* Super Block Read Operations */ /*======================================================================*/ enum { Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask, Opt_allow_utime, Opt_codepage, Opt_charset, Opt_utf8, Opt_namecase, Opt_tz_utc, Opt_adj_hidsect, Opt_delay, Opt_smart, Opt_ausize, Opt_packing, Opt_defrag, Opt_symlink, Opt_debug, Opt_err_cont, Opt_err_panic, Opt_err_ro, Opt_err, Opt_discard, Opt_fs, Opt_adj_req, }; static const match_table_t sdfat_tokens = { {Opt_uid, "uid=%u"}, {Opt_gid, "gid=%u"}, {Opt_umask, "umask=%o"}, {Opt_dmask, "dmask=%o"}, {Opt_fmask, "fmask=%o"}, {Opt_allow_utime, "allow_utime=%o"}, {Opt_codepage, "codepage=%u"}, {Opt_charset, "iocharset=%s"}, {Opt_utf8, "utf8"}, {Opt_namecase, "namecase=%u"}, {Opt_tz_utc, "tz=UTC"}, {Opt_adj_hidsect, "adj_hid"}, {Opt_delay, "delay"}, {Opt_smart, "smart"}, {Opt_ausize, "ausize=%u"}, {Opt_packing, "packing=%u"}, {Opt_defrag, "defrag"}, {Opt_symlink, "symlink=%u"}, {Opt_debug, "debug"}, {Opt_err_cont, "errors=continue"}, {Opt_err_panic, "errors=panic"}, {Opt_err_ro, "errors=remount-ro"}, {Opt_discard, "discard"}, {Opt_fs, "fs=%s"}, {Opt_adj_req, "adj_req"}, {Opt_err, NULL} }; static int parse_options(struct super_block *sb, char *options, int silent, int *debug, struct sdfat_mount_options *opts) { char *p; substring_t args[MAX_OPT_ARGS]; int option, i; char *tmpstr; opts->fs_uid = current_uid(); opts->fs_gid = current_gid(); opts->fs_fmask = opts->fs_dmask = current->fs->umask; opts->allow_utime = (unsigned short) -1; opts->codepage = sdfat_default_codepage; opts->iocharset = sdfat_default_iocharset; opts->casesensitive = 0; opts->utf8 = 0; opts->adj_hidsect = 0; opts->tz_utc = 0; opts->improved_allocation = 0; opts->amap_opt.pack_ratio = 0; // Default packing opts->amap_opt.sect_per_au = 0; opts->amap_opt.misaligned_sect = 0; opts->symlink = 0; opts->errors = SDFAT_ERRORS_RO; opts->discard = 0; *debug = 0; if (!options) goto out; while ((p = strsep(&options, ",")) != NULL) { int token; if (!*p) continue; token = match_token(p, sdfat_tokens, args); switch (token) { case Opt_uid: if (match_int(&args[0], &option)) return 0; opts->fs_uid = make_kuid(current_user_ns(), option); break; case Opt_gid: if (match_int(&args[0], &option)) return 0; opts->fs_gid = make_kgid(current_user_ns(), option); break; case Opt_umask: case Opt_dmask: case Opt_fmask: if (match_octal(&args[0], &option)) return 0; if (token != Opt_dmask) opts->fs_fmask = option; if (token != Opt_fmask) opts->fs_dmask = option; break; case Opt_allow_utime: if (match_octal(&args[0], &option)) return 0; opts->allow_utime = option & (S_IWGRP | S_IWOTH); break; case Opt_codepage: if (match_int(&args[0], &option)) return 0; opts->codepage = option; break; case Opt_charset: if (opts->iocharset != sdfat_default_iocharset) kfree(opts->iocharset); tmpstr = match_strdup(&args[0]); if (!tmpstr) return -ENOMEM; opts->iocharset = tmpstr; break; case Opt_namecase: if (match_int(&args[0], &option)) return 0; opts->casesensitive = option > 0 ? 1 : 0; break; case Opt_utf8: opts->utf8 = 1; break; case Opt_adj_hidsect: opts->adj_hidsect = 1; break; case Opt_tz_utc: opts->tz_utc = 1; break; case Opt_symlink: if (match_int(&args[0], &option)) return 0; opts->symlink = option > 0 ? 1 : 0; break; case Opt_delay: opts->improved_allocation |= SDFAT_ALLOC_DELAY; break; case Opt_smart: opts->improved_allocation |= SDFAT_ALLOC_SMART; break; case Opt_ausize: if (match_int(&args[0], &option)) return -EINVAL; if (!is_power_of_2(option)) return -EINVAL; opts->amap_opt.sect_per_au = option; IMSG("set AU size by option : %u sectors\n", option); break; case Opt_packing: if (match_int(&args[0], &option)) return 0; opts->amap_opt.pack_ratio = option; break; case Opt_defrag: #ifdef CONFIG_SDFAT_DFR opts->defrag = 1; #else IMSG("defragmentation config is not enabled. ignore\n"); #endif break; case Opt_err_cont: opts->errors = SDFAT_ERRORS_CONT; break; case Opt_err_panic: opts->errors = SDFAT_ERRORS_PANIC; break; case Opt_err_ro: opts->errors = SDFAT_ERRORS_RO; break; case Opt_debug: *debug = 1; break; case Opt_discard: opts->discard = 1; break; case Opt_fs: tmpstr = match_strdup(&args[0]); if (!tmpstr) return -ENOMEM; for (i=0; ifs_type = (unsigned char)i; sdfat_log_msg(sb, KERN_ERR, "set fs-type by option : %s", FS_TYPE_STR[i]); break; } } kfree(tmpstr); if (i == FS_TYPE_MAX) { sdfat_log_msg(sb, KERN_ERR, "invalid fs-type, " "only allow auto, exfat, vfat"); return -EINVAL; } break; case Opt_adj_req: #ifdef CONFIG_SDFAT_ALIGNED_MPAGE_WRITE opts->adj_req = 1; #else IMSG("adjust request config is not enabled. ignore\n"); #endif break; default: if (!silent) { sdfat_msg(sb, KERN_ERR, "unrecognized mount option \"%s\" " "or missing value", p); } return -EINVAL; } } out: if (opts->allow_utime == (unsigned short) -1) opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); if (opts->utf8 && strcmp(opts->iocharset, sdfat_iocharset_with_utf8)) { sdfat_msg(sb, KERN_WARNING, "utf8 enabled, \"iocharset=%s\" is recommended", sdfat_iocharset_with_utf8); } if (opts->discard) { struct request_queue *q = bdev_get_queue(sb->s_bdev); if (!blk_queue_discard(q)) sdfat_msg(sb, KERN_WARNING, "mounting with \"discard\" option, but " "the device does not support discard"); opts->discard = 0; } return 0; } static void sdfat_hash_init(struct super_block *sb) { struct sdfat_sb_info *sbi = SDFAT_SB(sb); int i; spin_lock_init(&sbi->inode_hash_lock); for (i = 0; i < SDFAT_HASH_SIZE; i++) INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); } static int sdfat_read_root(struct inode *inode) { struct super_block *sb = inode->i_sb; struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct timespec ts; FS_INFO_T *fsi = &(sbi->fsi); DIR_ENTRY_T info; ts = CURRENT_TIME_SEC; SDFAT_I(inode)->fid.dir.dir = fsi->root_dir; SDFAT_I(inode)->fid.dir.flags = 0x01; SDFAT_I(inode)->fid.entry = -1; SDFAT_I(inode)->fid.start_clu = fsi->root_dir; SDFAT_I(inode)->fid.flags = 0x01; SDFAT_I(inode)->fid.type = TYPE_DIR; SDFAT_I(inode)->fid.rwoffset = 0; SDFAT_I(inode)->fid.hint_bmap.off = -1; SDFAT_I(inode)->fid.hint_stat.eidx = 0; SDFAT_I(inode)->fid.hint_stat.clu = fsi->root_dir; SDFAT_I(inode)->target = NULL; if (fsapi_read_inode(inode, &info) < 0) return -EIO; inode->i_uid = sbi->options.fs_uid; inode->i_gid = sbi->options.fs_gid; inode->i_version++; inode->i_generation = 0; inode->i_mode = sdfat_make_mode(sbi, ATTR_SUBDIR, S_IRWXUGO); inode->i_op = &sdfat_dir_inode_operations; inode->i_fop = &sdfat_dir_operations; i_size_write(inode, info.Size); SDFAT_I(inode)->fid.size = info.Size; inode->i_blocks = ( (i_size_read(inode) + (fsi->cluster_size - 1)) & ~((loff_t)fsi->cluster_size - 1) ) >> inode->i_blkbits; SDFAT_I(inode)->i_pos = ((loff_t) fsi->root_dir << 32) | 0xffffffff; SDFAT_I(inode)->i_size_aligned = i_size_read(inode); SDFAT_I(inode)->i_size_ondisk = i_size_read(inode); sdfat_save_attr(inode, ATTR_SUBDIR); inode->i_mtime = inode->i_atime = inode->i_ctime = ts; set_nlink(inode,info.NumSubdirs + 2); return 0; } static void setup_dops(struct super_block *sb) { if (SDFAT_SB(sb)->options.casesensitive == 0) sb->s_d_op = &sdfat_ci_dentry_ops; else sb->s_d_op = &sdfat_dentry_ops; } static int sdfat_fill_super(struct super_block *sb, void *data, int silent) { struct inode *root_inode = NULL; struct sdfat_sb_info *sbi; int debug; int err; char buf[50]; struct block_device *bdev = sb->s_bdev; dev_t bd_dev = bdev ? bdev->bd_dev : 0; sdfat_log_msg(sb, KERN_INFO, "trying to mount..."); /* * GFP_KERNEL is ok here, because while we do hold the * supeblock lock, memory pressure can't call back into * the filesystem, since we're only just about to mount * it and have no inodes etc active! */ sbi = kzalloc(sizeof(struct sdfat_sb_info), GFP_KERNEL); if (!sbi) { sdfat_log_msg(sb, KERN_INFO, "trying to alloc sbi with vzalloc()"); sbi = vzalloc(sizeof(struct sdfat_sb_info)); if (!sbi) { sdfat_log_msg(sb, KERN_ERR, "failed to mount! (ENOMEM)"); return -ENOMEM; } sbi->use_vmalloc = 1; } mutex_init(&sbi->s_vlock); sb->s_fs_info = sbi; sb->s_flags |= MS_NODIRATIME; sb->s_magic = SDFAT_SUPER_MAGIC; sb->s_op = &sdfat_sops; ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST); err = parse_options(sb, data, silent, &debug, &sbi->options); if (err) { sdfat_log_msg(sb, KERN_ERR, "failed to parse options"); goto failed_mount; } setup_sdfat_sync_super_wq(sb); setup_dops(sb); err = fsapi_mount(sb); if (err) { sdfat_log_msg(sb, KERN_ERR, "failed to recognize fat type"); goto failed_mount; } /* set up enough so that it can read an inode */ sdfat_hash_init(sb); /* * The low byte of FAT's first entry must have same value with * media-field. But in real world, too many devices is * writing wrong value. So, removed that validity check. * * if (FAT_FIRST_ENT(sb, media) != first) */ err = -EINVAL; sprintf(buf, "cp%d", sbi->options.codepage); sbi->nls_disk = load_nls(buf); if (!sbi->nls_disk) { sdfat_log_msg(sb, KERN_ERR, "codepage %s not found", buf); goto failed_mount2; } sbi->nls_io = load_nls(sbi->options.iocharset); if (!sbi->nls_io) { sdfat_log_msg(sb, KERN_ERR, "IO charset %s not found", sbi->options.iocharset); goto failed_mount2; } err = __alloc_dfr_mem_if_required(sb); if (err) { sdfat_log_msg(sb, KERN_ERR, "failed to initialize a memory for " "defragmentation"); goto failed_mount3; } err = -ENOMEM; root_inode = new_inode(sb); if (!root_inode) { sdfat_log_msg(sb, KERN_ERR, "failed to allocate root inode."); goto failed_mount3; } root_inode->i_ino = SDFAT_ROOT_INO; root_inode->i_version = 1; err = sdfat_read_root(root_inode); if (err) { sdfat_log_msg(sb, KERN_ERR, "failed to initialize root inode."); goto failed_mount3; } sdfat_attach(root_inode, SDFAT_I(root_inode)->i_pos); insert_inode_hash(root_inode); err = -ENOMEM; sb->s_root = __d_make_root(root_inode); if (!sb->s_root) { sdfat_msg(sb, KERN_ERR, "failed to get the root dentry"); goto failed_mount3; } /* * Initialize filesystem attributes (for sysfs) * ex: /sys/fs/sdfat/mmcblk1[179:17] */ sbi->sb_kobj.kset = sdfat_kset; err = kobject_init_and_add(&sbi->sb_kobj, &sdfat_ktype, NULL, "%s[%d:%d]", sb->s_id, MAJOR(bd_dev), MINOR(bd_dev)); if (err) { sdfat_msg(sb, KERN_ERR, "Unable to create sdfat attributes for" " %s[%d:%d](%d)", sb->s_id, MAJOR(bd_dev), MINOR(bd_dev), err); goto failed_mount3; } sdfat_log_msg(sb, KERN_INFO, "mounted successfully!"); return 0; failed_mount3: __free_dfr_mem_if_required(sb); failed_mount2: fsapi_umount(sb); failed_mount: sdfat_log_msg(sb, KERN_INFO, "failed to mount! (%d)", err); if (root_inode) iput(root_inode); sb->s_root = NULL; if (sbi->nls_io) unload_nls(sbi->nls_io); if (sbi->nls_disk) unload_nls(sbi->nls_disk); if (sbi->options.iocharset != sdfat_default_iocharset) kfree(sbi->options.iocharset); sb->s_fs_info = NULL; if (!sbi->use_vmalloc) kfree(sbi); else vfree(sbi); return err; } static struct dentry *sdfat_fs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { return mount_bdev(fs_type, flags, dev_name, data, sdfat_fill_super); } static void init_once(void *foo) { struct sdfat_inode_info *ei = (struct sdfat_inode_info *)foo; INIT_HLIST_NODE(&ei->i_hash_fat); inode_init_once(&ei->vfs_inode); } static int __init sdfat_init_inodecache(void) { sdfat_inode_cachep = kmem_cache_create("sdfat_inode_cache", sizeof(struct sdfat_inode_info), 0, (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), init_once); if (!sdfat_inode_cachep) return -ENOMEM; return 0; } static void sdfat_destroy_inodecache(void) { kmem_cache_destroy(sdfat_inode_cachep); } #ifdef CONFIG_SDFAT_DBG_IOCTL static void sdfat_debug_kill_sb(struct super_block *sb) { struct sdfat_sb_info *sbi = SDFAT_SB(sb); struct block_device *bdev = sb->s_bdev; long flags; if (sbi) { flags = sbi->debug_flags; if (flags & SDFAT_DEBUGFLAGS_INVALID_UMOUNT) { /* invalidate_bdev drops all device cache include dirty. we use this to simulate device removal */ fsapi_cache_release(sb); invalidate_bdev(bdev); } } kill_block_super(sb); } #endif /* CONFIG_SDFAT_DBG_IOCTL */ static struct file_system_type sdfat_fs_type = { .owner = THIS_MODULE, .name = "sdfat", .mount = sdfat_fs_mount, #ifdef CONFIG_SDFAT_DBG_IOCTL .kill_sb = sdfat_debug_kill_sb, #else .kill_sb = kill_block_super, #endif /* CONFIG_SDFAT_DBG_IOCTL */ .fs_flags = FS_REQUIRES_DEV, }; static int __init init_sdfat_fs(void) { int err; sdfat_log_version(); err = fsapi_init(); if (err) goto error; sdfat_kset = kset_create_and_add("sdfat", NULL, fs_kobj); if (!sdfat_kset) { printk(KERN_ERR "[SDFAT] failed to create fs_kobj\n"); err = -ENOMEM; goto error; } err = sysfs_create_group(&sdfat_kset->kobj, &attr_group); if (err) { printk(KERN_ERR "[SDFAT] failed to create sdfat " "version attributes\n"); goto error; } err = sdfat_init_inodecache(); if (err) { printk(KERN_ERR "[SDFAT] failed to initialize inode cache\n"); goto error; } err = register_filesystem(&sdfat_fs_type); if (err) { printk(KERN_ERR "[SDFAT] failed to register filesystem\n"); goto error; } return 0; error: if (sdfat_kset) { sysfs_remove_group(&sdfat_kset->kobj, &attr_group); kset_unregister(sdfat_kset); sdfat_kset = NULL; } sdfat_destroy_inodecache(); fsapi_shutdown(); printk(KERN_ERR "[SDFAT] failed to initialize FS driver " "(err:%d)\n", err); return err; } static void __exit exit_sdfat_fs(void) { if (sdfat_kset) { sysfs_remove_group(&sdfat_kset->kobj, &attr_group); kset_unregister(sdfat_kset); sdfat_kset = NULL; } sdfat_destroy_inodecache(); unregister_filesystem(&sdfat_fs_type); fsapi_shutdown(); } module_init(init_sdfat_fs); module_exit(exit_sdfat_fs); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("FAT/exFAT filesystem support"); MODULE_AUTHOR("Samsung Electronics Co., Ltd.");