| Message ID | 200902102257.n1AMvwKl006860@imap1.linux-foundation.org |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
On Tue, Feb 10, 2009 at 02:57:58PM -0800, akpm@linux-foundation.org wrote: > > The patch titled > ext2: fix support for empty directory blocks in 64k blocksize filesystems > has been added to the -mm tree. Its filename is > ext2-fix-support-for-empty-directory-blocks-in-64k-blocksize-filesystems.patch NACK. The commit description is incomplete, we need to discuss more what's the best way of handling this. See the discussion around the ext4 patch on linux-ext4 for more details. This patch is entirely moot for ext2 in any case, since EXT2_MAX_BLOCK_SIZE was never changed from 4096. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff -puN fs/ext2/dir.c~ext2-fix-support-for-empty-directory-blocks-in-64k-blocksize-filesystems fs/ext2/dir.c --- a/fs/ext2/dir.c~ext2-fix-support-for-empty-directory-blocks-in-64k-blocksize-filesystems +++ a/fs/ext2/dir.c @@ -33,7 +33,7 @@ static inline unsigned ext2_rec_len_from { unsigned len = le16_to_cpu(dlen); - if (len == EXT2_MAX_REC_LEN) + if (len == EXT2_MAX_REC_LEN || len == 0) return 1 << 16; return len; } @@ -41,7 +41,7 @@ static inline unsigned ext2_rec_len_from static inline __le16 ext2_rec_len_to_disk(unsigned len) { if (len == (1 << 16)) - return cpu_to_le16(EXT2_MAX_REC_LEN); + return cpu_to_le16(0); else BUG_ON(len > (1 << 16)); return cpu_to_le16(len);
The patch titled ext2: fix support for empty directory blocks in 64k blocksize filesystems has been added to the -mm tree. Its filename is ext2-fix-support-for-empty-directory-blocks-in-64k-blocksize-filesystems.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: ext2: fix support for empty directory blocks in 64k blocksize filesystems From: Wei Yongjun <yjwei@cn.fujitsu.com> The rec_len field in the directory entry is 16 bits, so if the filesystem is completely empty, rec_len of 0 is used to designate 65536 in e2fsprogs, for the case where the directory entry takes the entire 64k block. But if an empty directory is read, an error message will be output by current kernels. You can use the following commands to reproduce it. - mkfs.ext2 -b $(( 64 * 1024 )) /dev/sdc1 - mount /dev/sda1 /mnt - cd /mnt/lost+found - ll - tail /var/log/messages EXT2-fs error (device sdc1): ext2_check_page: bad entry in \ directory #11: : rec_len is smaller than minimal - offset=65536, \ inode=0, rec_len=0, name_len=0 EXT2-fs error (device sdc1): ext2_readdir: bad page in #11 Treat a rec_len of 0 as 65536, as e2fsprogs does. Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> --- fs/ext2/dir.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)