linux/fs/ext4/inline.c, branch v3.19

ext4: ext4_da_convert_inline_data_to_extent drop locked page after error

2014-12-06T02:37:15Z

Testcase: xfstests generic/270 MKFS_OPTIONS="-q -I 256 -O inline_data,64bit" Call Trace: [] lock_page+0x35/0x39 -------> DEADLOCK [] pagecache_get_page+0x65/0x15a [] truncate_inode_pages_range+0x1db/0x45c [] ? ext4_da_get_block_prep+0x439/0x4b6 [] ? __block_write_begin+0x284/0x29c [] ? ext4_change_inode_journal_flag+0x16b/0x16b [] truncate_inode_pages+0x12/0x14 [] ext4_truncate_failed_write+0x19/0x25 [] ext4_da_write_inline_data_begin+0x196/0x31c [] ext4_da_write_begin+0x189/0x302 [] ? trace_hardirqs_on+0xd/0xf [] ? read_seqcount_begin.clone.1+0x9f/0xcc [] generic_perform_write+0xc7/0x1c6 [] ? mark_held_locks+0x59/0x77 [] __generic_file_write_iter+0x17f/0x1c5 [] ext4_file_write_iter+0x2a5/0x354 [] ? file_start_write+0x2a/0x2c [] ? bad_area_nosemaphore+0x13/0x15 [] new_sync_write+0x8a/0xb2 [] vfs_write+0xb5/0x14d [] SyS_write+0x5c/0x8c [] system_call_fastpath+0x12/0x17 Signed-off-by: Dmitry Monakhov Signed-off-by: Theodore Ts'o

ext4: ext4_inline_data_fiemap should respect callers argument

2014-12-02T21:11:20Z

Currently ext4_inline_data_fiemap ignores requested arguments (start and len) which may lead endless loop if start != 0. Also fix incorrect extent length determination. Signed-off-by: Dmitry Monakhov Signed-off-by: Theodore Ts'o

ext4: prevent fsreentrance deadlock for inline_data

2014-12-02T21:09:50Z

ext4_da_convert_inline_data_to_extent() invokes grab_cache_page_write_begin(). grab_cache_page_write_begin performs memory allocation, so fs-reentrance should be prohibited because we are inside journal transaction. Signed-off-by: Dmitry Monakhov Signed-off-by: Theodore Ts'o

ext4: Replace open coded mdata csum feature to helper function

2014-10-13T07:36:16Z

Besides the fact that this replacement improves code readability it also protects from errors caused direct EXT4_S(sb)->s_es manipulation which may result attempt to use uninitialized csum machinery. #Testcase_BEGIN IMG=/dev/ram0 MNT=/mnt mkfs.ext4 $IMG mount $IMG $MNT #Enable feature directly on disk, on mounted fs tune2fs -O metadata_csum $IMG # Provoke metadata update, likey result in OOPS touch $MNT/test umount $MNT #Testcase_END # Replacement script @@ expression E; @@ - EXT4_HAS_RO_COMPAT_FEATURE(E, EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) + ext4_has_metadata_csum(E) https://bugzilla.kernel.org/show_bug.cgi?id=82201 Signed-off-by: Dmitry Monakhov Signed-off-by: Theodore Ts'o Cc: stable@vger.kernel.org

ext4: don't keep using page if inline conversion fails

2014-09-11T15:45:12Z

If inline->extent conversion fails (most probably due to ENOSPC) and we release the temporary page that we allocated to transfer the file contents, don't keep using the page pointer after releasing the page. This occasionally leads to complaints about evicting locked pages or hangs when blocksize > pagesize, because it's possible for the page to get reallocated elsewhere in the meantime. Signed-off-by: Darrick J. Wong Signed-off-by: Theodore Ts'o Reviewed-by: Jan Kara Cc: Tao Ma

ext4: check inline directory before converting

2014-07-28T17:06:26Z

Before converting an inline directory to a regular directory, check the directory entries to make sure they're not obviously broken. This helps us to avoid a BUG_ON if one of the dirents is trashed. Signed-off-by: Darrick J. Wong Signed-off-by: Theodore Ts'o Reviewed-by: Andreas Dilger

ext4: make ext4_has_inline_data() as a inline function

2014-07-15T14:10:04Z

Now ext4_has_inline_data() is used in wide spread codepaths. So we need to make it as a inline function to avoid burning some CPU cycles. Change in text size: text data bss dec hex filename before: 326110 19258 5528 350896 55ab0 fs/ext4/ext4.o after: 326227 19258 5528 351013 55b25 fs/ext4/ext4.o I use the following script to measure the CPU usage. #!/bin/bash shm_base='/dev/shm' img=${shm_base}/ext4-img mnt=/mnt/loop e2fsprgs_base=$HOME/e2fsprogs mkfs=${e2fsprgs_base}/misc/mke2fs fsck=${e2fsprgs_base}/e2fsck/e2fsck sudo umount $mnt dd if=/dev/zero of=$img bs=4k count=3145728 ${mkfs} -t ext4 -O inline_data -F $img sudo mount -t ext4 -o loop $img $mnt # start testing... testdir="${mnt}/testdir" mkdir $testdir cd $testdir echo "start testing..." for ((cnt=0;cnt<100;cnt++)); do for ((i=0;i<5;i++)); do for ((j=0;j<5;j++)); do for ((k=0;k<5;k++)); do for ((l=0;l<5;l++)); do mkdir -p $i/$j/$k/$l echo "$i-$j-$k-$l" > $i/$j/$k/$l/testfile done done done done ls -R $testdir > /dev/null rm -rf $testdir/* done The result of `perf top -G -U` is as below. vanilla: 13.92% [ext4] [k] ext4_do_update_inode 9.36% [ext4] [k] __ext4_get_inode_loc 4.07% [ext4] [k] ftrace_define_fields_ext4_writepages 3.83% [ext4] [k] __ext4_handle_dirty_metadata 3.42% [ext4] [k] ext4_get_inode_flags 2.71% [ext4] [k] ext4_mark_iloc_dirty 2.46% [ext4] [k] ftrace_define_fields_ext4_direct_IO_enter 2.26% [ext4] [k] ext4_get_inode_loc 2.22% [ext4] [k] ext4_has_inline_data [...] After applied the patch, we don't see ext4_has_inline_data() because it has been inlined and perf couldn't sample it. Although it doesn't mean that the CPU cycles can be saved but at least the overhead of function calls can be eliminated. So IMHO we'd better inline this function. Cc: Andreas Dilger Signed-off-by: Zheng Liu Signed-off-by: Theodore Ts'o

ext4: add missing BUFFER_TRACE before ext4_journal_get_write_access

2014-05-13T02:06:43Z

Make them more consistently Signed-off-by: xieliang Signed-off-by: "Theodore Ts'o"

ext4: make local functions static

2014-05-12T14:50:23Z

I have been running make namespacecheck to look for unneeded globals, and found these in ext4. Signed-off-by: Stephen Hemminger Signed-off-by: "Theodore Ts'o"

ext4: delete "set but not used" variables

2014-01-11T18:26:56Z

Signed-off-by: Jon Ernst Signed-off-by: "Theodore Ts'o" Reviewed-by: Zheng Liu