From 7bb307e894d51308aa0582a8c4cc5875bbc645b9 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 23 Feb 2013 14:51:48 -0500 Subject: [PATCH] export kernel_write(), convert open-coded instances Signed-off-by: Al Viro --- drivers/mtd/nand/nandsim.c | 34 ++++++++++++--------------------- fs/ecryptfs/read_write.c | 6 +----- fs/splice.c | 5 +++-- include/linux/fs.h | 1 + kernel/sysctl_binary.c | 39 +++++++------------------------------- 5 files changed, 24 insertions(+), 61 deletions(-) diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c index 818b65c85d12..8f30d385bfa3 100644 --- a/drivers/mtd/nand/nandsim.c +++ b/drivers/mtd/nand/nandsim.c @@ -1408,40 +1408,32 @@ static void clear_memalloc(int memalloc) current->flags &= ~PF_MEMALLOC; } -static ssize_t read_file(struct nandsim *ns, struct file *file, void *buf, size_t count, loff_t *pos) +static ssize_t read_file(struct nandsim *ns, struct file *file, void *buf, size_t count, loff_t pos) { - mm_segment_t old_fs; ssize_t tx; int err, memalloc; - err = get_pages(ns, file, count, *pos); + err = get_pages(ns, file, count, pos); if (err) return err; - old_fs = get_fs(); - set_fs(get_ds()); memalloc = set_memalloc(); - tx = vfs_read(file, (char __user *)buf, count, pos); + tx = kernel_read(file, pos, buf, count); clear_memalloc(memalloc); - set_fs(old_fs); put_pages(ns); return tx; } -static ssize_t write_file(struct nandsim *ns, struct file *file, void *buf, size_t count, loff_t *pos) +static ssize_t write_file(struct nandsim *ns, struct file *file, void *buf, size_t count, loff_t pos) { - mm_segment_t old_fs; ssize_t tx; int err, memalloc; - err = get_pages(ns, file, count, *pos); + err = get_pages(ns, file, count, pos); if (err) return err; - old_fs = get_fs(); - set_fs(get_ds()); memalloc = set_memalloc(); - tx = vfs_write(file, (char __user *)buf, count, pos); + tx = kernel_write(file, buf, count, pos); clear_memalloc(memalloc); - set_fs(old_fs); put_pages(ns); return tx; } @@ -1511,7 +1503,7 @@ static void read_page(struct nandsim *ns, int num) if (do_read_error(ns, num)) return; pos = (loff_t)ns->regs.row * ns->geom.pgszoob + ns->regs.column + ns->regs.off; - tx = read_file(ns, ns->cfile, ns->buf.byte, num, &pos); + tx = read_file(ns, ns->cfile, ns->buf.byte, num, pos); if (tx != num) { NS_ERR("read_page: read error for page %d ret %ld\n", ns->regs.row, (long)tx); return; @@ -1573,7 +1565,7 @@ static int prog_page(struct nandsim *ns, int num) u_char *pg_off; if (ns->cfile) { - loff_t off, pos; + loff_t off; ssize_t tx; int all; @@ -1585,8 +1577,7 @@ static int prog_page(struct nandsim *ns, int num) memset(ns->file_buf, 0xff, ns->geom.pgszoob); } else { all = 0; - pos = off; - tx = read_file(ns, ns->cfile, pg_off, num, &pos); + tx = read_file(ns, ns->cfile, pg_off, num, off); if (tx != num) { NS_ERR("prog_page: read error for page %d ret %ld\n", ns->regs.row, (long)tx); return -1; @@ -1595,16 +1586,15 @@ static int prog_page(struct nandsim *ns, int num) for (i = 0; i < num; i++) pg_off[i] &= ns->buf.byte[i]; if (all) { - pos = (loff_t)ns->regs.row * ns->geom.pgszoob; - tx = write_file(ns, ns->cfile, ns->file_buf, ns->geom.pgszoob, &pos); + loff_t pos = (loff_t)ns->regs.row * ns->geom.pgszoob; + tx = write_file(ns, ns->cfile, ns->file_buf, ns->geom.pgszoob, pos); if (tx != ns->geom.pgszoob) { NS_ERR("prog_page: write error for page %d ret %ld\n", ns->regs.row, (long)tx); return -1; } ns->pages_written[ns->regs.row] = 1; } else { - pos = off; - tx = write_file(ns, ns->cfile, pg_off, num, &pos); + tx = write_file(ns, ns->cfile, pg_off, num, off); if (tx != num) { NS_ERR("prog_page: write error for page %d ret %ld\n", ns->regs.row, (long)tx); return -1; diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c index b2a34a192f4f..6a160539cd23 100644 --- a/fs/ecryptfs/read_write.c +++ b/fs/ecryptfs/read_write.c @@ -40,16 +40,12 @@ int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data, loff_t offset, size_t size) { struct file *lower_file; - mm_segment_t fs_save; ssize_t rc; lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file; if (!lower_file) return -EIO; - fs_save = get_fs(); - set_fs(get_ds()); - rc = vfs_write(lower_file, data, size, &offset); - set_fs(fs_save); + rc = kernel_write(lower_file, data, size, offset); mark_inode_dirty_sync(ecryptfs_inode); return rc; } diff --git a/fs/splice.c b/fs/splice.c index 963213d56403..718bd0056384 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -569,7 +569,7 @@ static ssize_t kernel_readv(struct file *file, const struct iovec *vec, return res; } -static ssize_t kernel_write(struct file *file, const char *buf, size_t count, +ssize_t kernel_write(struct file *file, const char *buf, size_t count, loff_t pos) { mm_segment_t old_fs; @@ -578,11 +578,12 @@ static ssize_t kernel_write(struct file *file, const char *buf, size_t count, old_fs = get_fs(); set_fs(get_ds()); /* The cast to a user pointer is valid due to the set_fs() */ - res = vfs_write(file, (const char __user *)buf, count, &pos); + res = vfs_write(file, (__force const char __user *)buf, count, &pos); set_fs(old_fs); return res; } +EXPORT_SYMBOL(kernel_write); ssize_t default_file_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, diff --git a/include/linux/fs.h b/include/linux/fs.h index c766afd1e684..d858363a7c17 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2277,6 +2277,7 @@ static inline void i_readcount_inc(struct inode *inode) extern int do_pipe_flags(int *, int); extern int kernel_read(struct file *, loff_t, char *, unsigned long); +extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t); extern struct file * open_exec(const char *); /* fs/dcache.c -- generic fs support functions */ diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c index 5a6384450501..37f240fec37a 100644 --- a/kernel/sysctl_binary.c +++ b/kernel/sysctl_binary.c @@ -971,7 +971,6 @@ out: static ssize_t bin_intvec(struct file *file, void __user *oldval, size_t oldlen, void __user *newval, size_t newlen) { - mm_segment_t old_fs = get_fs(); ssize_t copied = 0; char *buffer; ssize_t result; @@ -984,13 +983,10 @@ static ssize_t bin_intvec(struct file *file, if (oldval && oldlen) { unsigned __user *vec = oldval; size_t length = oldlen / sizeof(*vec); - loff_t pos = 0; char *str, *end; int i; - set_fs(KERNEL_DS); - result = vfs_read(file, buffer, BUFSZ - 1, &pos); - set_fs(old_fs); + result = kernel_read(file, 0, buffer, BUFSZ - 1); if (result < 0) goto out_kfree; @@ -1017,7 +1013,6 @@ static ssize_t bin_intvec(struct file *file, if (newval && newlen) { unsigned __user *vec = newval; size_t length = newlen / sizeof(*vec); - loff_t pos = 0; char *str, *end; int i; @@ -1033,9 +1028,7 @@ static ssize_t bin_intvec(struct file *file, str += snprintf(str, end - str, "%lu\t", value); } - set_fs(KERNEL_DS); - result = vfs_write(file, buffer, str - buffer, &pos); - set_fs(old_fs); + result = kernel_write(file, buffer, str - buffer, 0); if (result < 0) goto out_kfree; } @@ -1049,7 +1042,6 @@ out: static ssize_t bin_ulongvec(struct file *file, void __user *oldval, size_t oldlen, void __user *newval, size_t newlen) { - mm_segment_t old_fs = get_fs(); ssize_t copied = 0; char *buffer; ssize_t result; @@ -1062,13 +1054,10 @@ static ssize_t bin_ulongvec(struct file *file, if (oldval && oldlen) { unsigned long __user *vec = oldval; size_t length = oldlen / sizeof(*vec); - loff_t pos = 0; char *str, *end; int i; - set_fs(KERNEL_DS); - result = vfs_read(file, buffer, BUFSZ - 1, &pos); - set_fs(old_fs); + result = kernel_read(file, 0, buffer, BUFSZ - 1); if (result < 0) goto out_kfree; @@ -1095,7 +1084,6 @@ static ssize_t bin_ulongvec(struct file *file, if (newval && newlen) { unsigned long __user *vec = newval; size_t length = newlen / sizeof(*vec); - loff_t pos = 0; char *str, *end; int i; @@ -1111,9 +1099,7 @@ static ssize_t bin_ulongvec(struct file *file, str += snprintf(str, end - str, "%lu\t", value); } - set_fs(KERNEL_DS); - result = vfs_write(file, buffer, str - buffer, &pos); - set_fs(old_fs); + result = kernel_write(file, buffer, str - buffer, 0); if (result < 0) goto out_kfree; } @@ -1127,19 +1113,15 @@ out: static ssize_t bin_uuid(struct file *file, void __user *oldval, size_t oldlen, void __user *newval, size_t newlen) { - mm_segment_t old_fs = get_fs(); ssize_t result, copied = 0; /* Only supports reads */ if (oldval && oldlen) { - loff_t pos = 0; char buf[40], *str = buf; unsigned char uuid[16]; int i; - set_fs(KERNEL_DS); - result = vfs_read(file, buf, sizeof(buf) - 1, &pos); - set_fs(old_fs); + result = kernel_read(file, 0, buf, sizeof(buf) - 1); if (result < 0) goto out; @@ -1175,18 +1157,14 @@ out: static ssize_t bin_dn_node_address(struct file *file, void __user *oldval, size_t oldlen, void __user *newval, size_t newlen) { - mm_segment_t old_fs = get_fs(); ssize_t result, copied = 0; if (oldval && oldlen) { - loff_t pos = 0; char buf[15], *nodep; unsigned long area, node; __le16 dnaddr; - set_fs(KERNEL_DS); - result = vfs_read(file, buf, sizeof(buf) - 1, &pos); - set_fs(old_fs); + result = kernel_read(file, 0, buf, sizeof(buf) - 1); if (result < 0) goto out; @@ -1215,7 +1193,6 @@ static ssize_t bin_dn_node_address(struct file *file, } if (newval && newlen) { - loff_t pos = 0; __le16 dnaddr; char buf[15]; int len; @@ -1232,9 +1209,7 @@ static ssize_t bin_dn_node_address(struct file *file, le16_to_cpu(dnaddr) >> 10, le16_to_cpu(dnaddr) & 0x3ff); - set_fs(KERNEL_DS); - result = vfs_write(file, buf, len, &pos); - set_fs(old_fs); + result = kernel_write(file, buf, len, 0); if (result < 0) goto out; }