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Date: Wed, 24 Sep 2014 18:14:15 +0800 From: Chao Yu <chao2.yu@...sung.com> To: Jaegeuk Kim <jaegeuk@...nel.org>, Changman Lee <cm224.lee@...sung.com> Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org Subject: [f2fs-dev][PATCH 0/6 v2] f2fs: support inline dir There are large space in f2fs inode, so last inline data patch set have made f2fs to acquire the ability of storing data of small file (less than ~3.4k) directly in inode block, but not support inline dir. In this patch, we make f2fs to support inline dir. Layout: Inline dir layout is the same as inline data layout, a. i_addr[0] are reserved space for converting from inline dir to regular one when out-of-space occur in inline dentry. b. i_addr[1..872] will be used as storing space of inline dentry. c. i_addr[873..922] are reserved for inline xattr. Size: Since our max size of inline dir space is limit to MAX_INLINE_DATA (3488 bytes), we introduce inline dentry struct fit for available space, then our dentry slot number in inline dentry reduce to 182, less than normal dentry block's 214. Process: In inline dir mode, our dir entries will be lookuped/stored/deleted in the inline dentry space of inode, util there are no more space to store new added dir entry, in this case we will convert inline dentry to normal 0-index dentry block and disable inline dir mode for this inode. Benefit points: a) space saving 1) Test with fsstress with special arguments, it can save about 7% space. time fsstress -c -p 20 -n 500 -l 10 -d /mnt/f2fs -w -f chown=0 -f creat=10 -f dwrite=0 -f fdatasync=0 -f fsync=0 -f link=10 -f mkdir=10 -f mknod=10 -f rename=0 -f rmdir=0 -f symlink=10 -f truncate=0 -f unlink=0 -f write=10 -S Dev 1K-blocks Used Available Use% Mounted on empty /dev/sdb 20969472 1134600 19691512 6% /mnt/f2fs based /dev/sdb 20969472 2331676 18494436 12% /mnt/f2fs patched /dev/sdb 20969472 2247480 18578632 11% /mnt/f2fs 2) Test with storing kernel src, it can save less than 1.4% space. empty /dev/sdb 20969472 1134600 19691512 6% /mnt/f2fs based /dev/sdb 20969472 1934656 18891456 10% /mnt/f2fs patched /dev/sdb 20969472 1923400 18902712 10% /mnt/f2fs b) performance Test with fsstress shows cost time reduce about 5%. time fsstress -d /mnt/f2fs -l 5 -n 1000 -p 20 -c -r based 135.652 s patched 129.256 s (mount -o inline_dentry) v2: o introduce f2fs_drop_nlink from f2fs_delete_entry to reuse code in f2fs_delete_inline_entry. o remove kmap/kunmap for inode page pointed out by Jaegeuk Kim. o introduce a new mount option inline_dentry for inline dir pointed out by Jaegeuk Kim. o rebase to last dev of f2fs (20140924). o retest performance/space-gain for inline dir excluding influence of inline data. Chao Yu (6): f2fs: add infra struct and helper for inline dir f2fs: add a new mount option for inline dir f2fs: export dir operations for inline dir f2fs: add key function to handle inline dir f2fs: enable inline dir handling f2fs: update f2fs documentation for inline dir support Documentation/filesystems/f2fs.txt | 4 + fs/f2fs/dir.c | 103 +++++++---- fs/f2fs/f2fs.h | 40 ++++- fs/f2fs/file.c | 2 +- fs/f2fs/inline.c | 347 +++++++++++++++++++++++++++++++++++++ fs/f2fs/namei.c | 38 ++-- fs/f2fs/recovery.c | 5 +- fs/f2fs/super.c | 7 + include/linux/f2fs_fs.h | 19 ++ 9 files changed, 512 insertions(+), 53 deletions(-) -- 2.0.1.474.g72c7794 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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