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UBIFS: add a superblock flag for free space fix-up
The 'space_fixup' flag can be set in the superblock of a new filesystem by mkfs.ubifs to indicate that any eraseblocks with free space remaining should be fixed-up the first time it's mounted (after which the flag is un-set). This means that the UBIFS image has been flashed by a "dumb" flasher and the free space has been actually programmed (writing all 0xFFs), so this free space cannot be used. UBIFS fixes the free space up by re-writing the contents of all LEBs with free space using the atomic LEB change UBI operation. Artem: improved commit message, add some more commentaries to the code. Signed-off-by: Matthew L. Creech <mlcreech@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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4 changed files with 7 additions and 0 deletions
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@ -316,6 +316,8 @@ void dbg_dump_node(const struct ubifs_info *c, const void *node)
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printk(KERN_DEBUG "\tflags %#x\n", sup_flags);
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printk(KERN_DEBUG "\t big_lpt %u\n",
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!!(sup_flags & UBIFS_FLG_BIGLPT));
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printk(KERN_DEBUG "\t space_fixup %u\n",
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!!(sup_flags & UBIFS_FLG_SPACE_FIXUP));
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printk(KERN_DEBUG "\tmin_io_size %u\n",
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le32_to_cpu(sup->min_io_size));
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printk(KERN_DEBUG "\tleb_size %u\n",
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@ -617,6 +617,7 @@ int ubifs_read_superblock(struct ubifs_info *c)
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c->vfs_sb->s_time_gran = le32_to_cpu(sup->time_gran);
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memcpy(&c->uuid, &sup->uuid, 16);
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c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT);
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c->space_fixup = !!(sup_flags & UBIFS_FLG_SPACE_FIXUP);
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/* Automatically increase file system size to the maximum size */
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c->old_leb_cnt = c->leb_cnt;
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@ -408,9 +408,11 @@ enum {
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* Superblock flags.
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*
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* UBIFS_FLG_BIGLPT: if "big" LPT model is used if set
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* UBIFS_FLG_SPACE_FIXUP: first-mount "fixup" of free space within LEBs needed
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*/
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enum {
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UBIFS_FLG_BIGLPT = 0x02,
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UBIFS_FLG_SPACE_FIXUP = 0x04,
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};
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/**
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@ -1014,6 +1014,7 @@ struct ubifs_debug_info;
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* @cmt_wq: wait queue to sleep on if the log is full and a commit is running
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*
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* @big_lpt: flag that LPT is too big to write whole during commit
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* @space_fixup: flag indicating that free space in LEBs needs to be cleaned up
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* @no_chk_data_crc: do not check CRCs when reading data nodes (except during
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* recovery)
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* @bulk_read: enable bulk-reads
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@ -1253,6 +1254,7 @@ struct ubifs_info {
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wait_queue_head_t cmt_wq;
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unsigned int big_lpt:1;
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unsigned int space_fixup:1;
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unsigned int no_chk_data_crc:1;
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unsigned int bulk_read:1;
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unsigned int default_compr:2;
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