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authorMatthew L. Creech <mlcreech@gmail.com>2011-05-05 16:33:20 -0400
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-05-16 14:12:14 +0300
commit9f58d3503a1368673609db1962e4a584261b62eb (patch)
tree9b31f7f6f6c8513d80b5e807f029d225c9be9b25 /fs/ubifs/ubifs.h
parente11602ea3e43392904db7a579dc990062ebb7151 (diff)
downloadop-kernel-dev-9f58d3503a1368673609db1962e4a584261b62eb.zip
op-kernel-dev-9f58d3503a1368673609db1962e4a584261b62eb.tar.gz
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>
Diffstat (limited to 'fs/ubifs/ubifs.h')
-rw-r--r--fs/ubifs/ubifs.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index a2f9d4e..8e27553 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1014,6 +1014,7 @@ struct ubifs_debug_info;
* @cmt_wq: wait queue to sleep on if the log is full and a commit is running
*
* @big_lpt: flag that LPT is too big to write whole during commit
+ * @space_fixup: flag indicating that free space in LEBs needs to be cleaned up
* @no_chk_data_crc: do not check CRCs when reading data nodes (except during
* recovery)
* @bulk_read: enable bulk-reads
@@ -1253,6 +1254,7 @@ struct ubifs_info {
wait_queue_head_t cmt_wq;
unsigned int big_lpt:1;
+ unsigned int space_fixup:1;
unsigned int no_chk_data_crc:1;
unsigned int bulk_read:1;
unsigned int default_compr:2;
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