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2013-09-05f2fs: optimize gc for better performanceJin Xu
This patch improves the gc efficiency by optimizing the victim selection policy. With this optimization, the random re-write performance could increase up to 20%. For f2fs, when disk is in shortage of free spaces, gc will selects dirty segments and moves valid blocks around for making more space available. The gc cost of a segment is determined by the valid blocks in the segment. The less the valid blocks, the higher the efficiency. The ideal victim segment is the one that has the most garbage blocks. Currently, it searches up to 20 dirty segments for a victim segment. The selected victim is not likely the best victim for gc when there are much more dirty segments. Why not searching more dirty segments for a better victim? The cost of searching dirty segments is negligible in comparison to moving blocks. In this patch, it enlarges the MAX_VICTIM_SEARCH to 4096 to make the search more aggressively for a possible better victim. Since it also applies to victim selection for SSR, it will likely improve the SSR efficiency as well. The test case is simple. It creates as many files until the disk full. The size for each file is 32KB. Then it writes as many as 100000 records of 4KB size to random offsets of random files in sync mode. The testing was done on a 2GB partition of a SDHC card. Let's see the test result of f2fs without and with the patch. --------------------------------------- 2GB partition, SDHC create 52023 files of size 32768 bytes random re-write 100000 records of 4KB --------------------------------------- | file creation (s) | rewrite time (s) | gc count | gc garbage blocks | [no patch] 341 4227 1174 174840 [patched] 324 2958 645 106682 It's obvious that, with the patch, f2fs finishes the test in 20+% less time than without the patch. And internally it does much less gc with higher efficiency than before. Since the performance improvement is related to gc, it might not be so obvious for other tests that do not trigger gc as often as this one ( This is because f2fs selects dirty segments for SSR use most of the time when free space is in shortage). The well-known iozone test tool was not used for benchmarking the patch becuase it seems do not have a test case that performs random re-write on a full disk. This patch is the revised version based on the suggestion from Jaegeuk Kim. Signed-off-by: Jin Xu <jinuxstyle@gmail.com> [Jaegeuk Kim: suggested simpler solution] Reviewed-by: Jaegeuk Kim <jaegeuk.kim@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-09-05f2fs: merge more bios of node block writesJaegeuk Kim
Previously, we experience bio traces as follows when running simple sequential write test. f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500104928, size = 4K f2fs_do_submit_bio: type = NODE, io = no sync, sector = 499922208, size = 368K f2fs_do_submit_bio: type = NODE, io = no sync, sector = 499914752, size = 140K -> total 512K The first one is to write an indirect node block, and the others are to write direct node blocks. The reason why there are two separate bios for direct node blocks is: 0. initial state ------------------ ------------------ | | |xxxxxxxx | ------------------ ------------------ 1. write 368K ------------------ ------------------ | | |xxxxxxxxWWWWWWWW| ------------------ ------------------ 2. write 140K ------------------ ------------------ |WWWWWWW | |xxxxxxxxWWWWWWWW| ------------------ ------------------ This is because f2fs_write_node_pages tries to write just 512K totally, so that we can lose the chance to merge more bios nicely. After this patch is applied, we can get the following bio traces. f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500103168, size = 8K f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500111368, size = 4K f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500107272, size = 512K f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500108296, size = 512K f2fs_do_submit_bio: type = NODE, io = no sync, sector = 500109320, size = 500K And finally, we can improve the sequential write performance, from 458.775 MB/s to 479.945 MB/s on SSD. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-09-03f2fs: avoid an overflow during utilization calculationJaegeuk Kim
The current f2fs uses all the block counts with 32 bit numbers, which is able to cover about 15TB volume. But in calculation of utilization, f2fs multiplies the count by 100 which can induce overflow. This patch fixes this. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-09-03f2fs: trigger GC when there are prefree segmentsJaegeuk Kim
Previously, f2fs conducts SSR when free_sections() < overprovision_sections. But, even though there are a lot of prefree segments, it can consider SSR only. So, let's consider the number of prefree segments too for triggering SSR. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-27f2fs: use strncasecmp() simplify the string comparisonGu Zheng
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-27f2fs: fix omitting to update inode pageJaegeuk Kim
The f2fs_set_link updates its parent inode number, so we should sync this to the inode block. Otherwise, the data can be lost after sudden-power-off. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-26f2fs: support the inline xattrsJaegeuk Kim
0. modified inode structure -------------------------------------- metadata (e.g., i_mtime, i_ctime, etc) -------------------------------------- direct pointers [0 ~ 873] inline xattrs (200 bytes by default) indirect pointers [0 ~ 4] -------------------------------------- node footer -------------------------------------- 1. setxattr flow - read_all_xattrs copies all the xattrs from inline and xattr node block. - handle xattr entries - write_all_xattrs copies modified xattrs into inline and xattr node block. 2. getxattr flow - read_all_xattrs copies all the xattrs from inline and xattr node block. - check target entries 3. Usage # mount -t f2fs -o inline_xattr $DEV $MNT Once mounted with the inline_xattr option, f2fs marks all the newly created files to reserve an amount of inline xattr space explicitly inside the inode block. Without the mount option, f2fs will not touch any existing files and newly created files as well. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-26f2fs: add the truncate_xattr_node functionJaegeuk Kim
The truncate_xattr_node function will be used by inline xattr. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-26f2fs: introduce __find_xattr for readabilityJaegeuk Kim
The __find_xattr is to search the wanted xattr entry starting from the base_addr. If not found, the returned entry is the last empty xattr entry that can be allocated newly. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-26f2fs: reserve the xattr space dynamicallyJaegeuk Kim
This patch enables the number of direct pointers inside on-disk inode block to be changed dynamically according to the size of inline xattr space. The number of direct pointers, ADDRS_PER_INODE, can be changed only if the file has inline xattr flag. The number of direct pointers that will be used by inline xattrs is defined as F2FS_INLINE_XATTR_ADDRS. Current patch assigns F2FS_INLINE_XATTR_ADDRS to 0 temporarily. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-26f2fs: add flags for inline xattrsJaegeuk Kim
This patch adds basic inode flags for inline xattrs, F2FS_INLINE_XATTR, and add a mount option, inline_xattr, which is enabled when xattr is set. If the mount option is enabled, all the files are marked with the inline_xattrs flag. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-26f2fs: fix error return code in init_f2fs_fs()Wei Yongjun
Fix to return -ENOMEM in the kset create and add error handling case instead of 0, as done elsewhere in this function. Introduced by commit b59d0bae6ca30c496f298881616258f9cde0d9c6. (f2fs: add sysfs support for controlling the gc_thread) Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Acked-by: Namjae Jeon <namjae.jeon@samsung.com> [Jaegeuk Kim: merge the patch with previous modification] Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-20f2fs: fix wrong BUG_ON conditionJaegeuk Kim
This patch removes a false-alaramed BUG_ON. The previous BUG_ON condition didn't cover the following true scenario. In f2fs_add_link, 1) get_new_data_page gives an uptodate page successfully, and then, 2) init_inode_metadata returns -ENOSPC. At this moment, a new clean data page is remained in the page cache, but its block address still indicates NEW_ADDR. After then, even if sync is called, this clean data page cannot be written to the disk due to the clean state. So this means that get_lock_data_page should make a new empty page when its block address is NEW_ADDR and its page is not uptodated. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-20f2fs: fix memory leak when init f2fs filesystem failZhao Hongjiang
When any of the caches create fails in init_f2fs_fs(), the other caches which are create successful should be free. Signed-off-by: Zhao Hongjiang <zhaohongjiang@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-19f2fs: fix a compound statement label errorGu Zheng
An error "label at end of compound statement" will occur if CONFIG_F2FS_STAT_FS disabled. fs/f2fs/segment.c:556:1: error: label at end of compound statement So clean up the 'out' label to fix it. Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-19f2fs: avoid writing inode redundantly when creating a fileJin Xu
In f2fs_write_inode, updating inode after f2fs_balance_fs is not a optimized way in the case that f2fs_gc is performed ahead. The inode page will be unnecessarily written out twice, one of which is in f2fs_gc->...->sync_node_pages and the other is in update_inode_page. Let's update the inode page in prior to f2fs_balance_fs to avoid this. To reproduce it, $ touch file (before this step, should make the device need f2fs_gc) $ sync (or wait the bdi to write dirty inode) Signed-off-by: Jin Xu <jinuxstyle@gmail.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-19f2fs: alloc_page() doesn't return an ERR_PTRDan Carpenter
alloc_page() returns a NULL on failure, it never returns an ERR_PTR. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-12f2fs: should cover i_xattr_nid with its xattr node page lockJaegeuk Kim
Previously, f2fs_setxattr assigns i_xattr_nid in the inode page inconsistently. The scenario is: = Thread 1 = = Thread 2 = = fi->i_xattr_nid = = on-disk nid = f2fs_setxattr 0 0 new_node_page X 0 sync_inode_page X X checkpoint X X -. grab_cache_page X X | --> allocate a new xattr node block or -ENOSPC <----------------' At this moment, the checkpoint stores inconsistent data where the inode has i_xattr_nid but actual xattr node block is not allocated yet. So, we should assign the real i_xattr_nid only after its xattr node block is allocated. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-12f2fs: check the free space first in new_node_pageJaegeuk Kim
Let's check the free space in prior to the main process of allocating a new node page. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-12f2fs: clean up the needless end 'return' of void functionGu Zheng
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-09f2fs: introduce cur_cp_version function to reduce code sizeJaegeuk Kim
This patch introduces a new inline function, cur_cp_version, to reduce redundant codes. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-09f2fs: fix inconsistency between xattr node blocks and its inodeJaegeuk Kim
Previously xattr node blocks are stored to the COLD_NODE log, which means that our roll-forward mechanism doesn't recover the xattr node blocks at all. Only the direct node blocks in the WARM_NODE log can be recovered. So, let's resolve the issue simply by conducting checkpoint during fsync when a file has a modified xattr node block. This approach is able to degrade the performance, but normally the checkpoint overhead is shown at the initial fsync call after the xattr entry changes. Once the checkpoint is done, no additional overhead would be occurred. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-09f2fs: fix the use of XATTR_NODE_OFFSETJaegeuk Kim
This patch fixes the use of XATTR_NODE_OFFSET. o The offset should not use several MSB bits which are used by marking node blocks. o IS_DNODE should handle XATTR_NODE_OFFSET to avoid potential abnormality during the fsync call. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-08f2fs: fix a build failure due to missing the kobject headerJaegeuk Kim
This patch should resolve the following error reported by kbuild test robot. All error/warnings: In file included from fs/f2fs/dir.c:13:0: >> fs/f2fs/f2fs.h:435:17: error: field 's_kobj' has incomplete type struct kobject s_kobj; The failure was caused by missing the kobject header file in dir.c. So, this patch move the header file to the right location, f2fs.h. CC: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-06f2fs: fix a deadlock in fsyncJin Xu
This patch fixes a deadlock bug that occurs quite often when there are concurrent write and fsync on a same file. Following is the simplified call trace when tasks get hung. fsync thread: - f2fs_sync_file ... - f2fs_write_data_pages ... - update_extent_cache ... - update_inode - wait_on_page_writeback bdi writeback thread - __writeback_single_inode - f2fs_write_data_pages - mutex_lock(sbi->writepages) The deadlock happens when the fsync thread waits on a inode page that has been added to the f2fs' cached bio sbi->bio[NODE], and unfortunately, no one else could be able to submit the cached bio to block layer for writeback. This is because the fsync thread already hold a sbi->fs_lock and the sbi->writepages lock, causing the bdi thread being blocked when attempt to write data pages for the same inode. At the same time, f2fs_gc thread does not notice the situation and could not help. Even the sync syscall gets blocked. To fix it, we could submit the cached bio first before waiting on a inode page that is being written back. Signed-off-by: Jin Xu <jinuxstyle@gmail.com> [Jaegeuk Kim: add more cases to use f2fs_wait_on_page_writeback] Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-06f2fs: remove redundant code from f2fs_write_beginNamjae Jeon
This code is being used for nobh_write_end() function. But since now f2fs_write_end function is added so there is no need for this code. Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-06f2fs: add sysfs entries to select the gc policyNamjae Jeon
Add sysfs entry gc_idle to control the gc policy. Where gc_idle = 1 corresponds to selecting a cost benefit approach, while gc_idle = 2 corresponds to selecting a greedy approach to garbage collection. The selection is mutually exclusive one approach will work at any point. If gc_idle = 0, then this option is disabled. Cc: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com> Reviewed-by: Gu Zheng <guz.fnst@cn.fujitsu.com> [Jaegeuk Kim: change the select_gc_type() flow slightly] Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-08-06f2fs: add sysfs support for controlling the gc_threadNamjae Jeon
Add sysfs entries to control the timing parameters for f2fs gc thread. Various Sysfs options introduced are: gc_min_sleep_time: Min Sleep time for GC in ms gc_max_sleep_time: Max Sleep time for GC in ms gc_no_gc_sleep_time: Default Sleep time for GC in ms Cc: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com> Reviewed-by: Gu Zheng <guz.fnst@cn.fujitsu.com> [Jaegeuk Kim: fix an umount bug and some minor changes] Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-31f2fs: remove an unneeded kfree(NULL)Dan Carpenter
This kfree() is no longer needed after a79dc083d7 "f2fs: move bio_private allocation out of f2fs_bio_alloc()". The "bio->bi_private" is NULL here so it's a no-op. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-30f2fs: fix handling orphan inodesJaegeuk Kim
This patch fixes mishandling of the sbi->n_orphans variable. If users request lots of f2fs_unlink(), check_orphan_space() could be contended. In such the case, sbi->n_orphans can be read incorrectly so that f2fs_unlink() would fall into the wrong state which results in the failure of add_orphan_inode(). So, let's increment sbi->n_orphans virtually prior to the actual orphan inode stuffs. After that, let's release sbi->n_orphans by calling release_orphan_inode or remove_orphan_inode. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-30f2fs: move bio_private allocation out of f2fs_bio_alloc()Gu Zheng
bio->bi_private is not always needed. As in the reading data path, end_read_io does not need bio_private for further using, so moving bio_private allocation out of f2fs_bio_alloc(). Alloc it in the submit_write_page(), and ignore it in the f2fs_readpage(). Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-30f2fs: use list_for_each rather than list_for_each_safe, in remove_orphan_inode()Gu Zheng
As we remove the target single node, so list_for_each is enought, in order to clean up, we use list_for_each_entry instead. Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-30f2fs: use seq_puts()/seq_putc() rather than seq_printf() where possibleGu Zheng
For string without format specifiers, using seq_puts()/seq_putc() instead of seq_printf(). Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-30f2fs: fix i_name during f2fs_sync_fileJaegeuk Kim
As similar as the i_pino fix, i_name also should be fixed when i_nlink is 1. The errorneous scenario is like this. 1. touch test1 2. link test1 test2 3. unlink test2 4. fsync test1 After this, i_name should be test1. CC: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-30f2fs: update file name in the inode block during f2fs_renameJaegeuk Kim
The error is reproducible by: 0. mkfs.f2fs /dev/sdb1 & mount 1. touch test1 2. touch test2 3. mv test1 test2 4. umount 5. dumpt.f2fs -i 4 /dev/sdb1 After this, when we retrieve the inode->i_name of test2 by dump.f2fs, we get test1 instead of test2. This is because f2fs didn't update the file name during the f2fs_rename. So, this patch fixes that. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-30f2fs: introduce help function F2FS_NODE()Gu Zheng
Introduce help function F2FS_NODE() to simplify the conversion of node_page to f2fs_node. Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-30f2fs: add a help func F2FS_STAT() to get the f2fs_stat_infoGu Zheng
Add a help func F2FS_STAT() to get the f2fs_stat_info. Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-30f2fs: add proc entry to monitor current usage of segmentsJaegeuk Kim
You can monitor valid block counts of whole segments in: /proc/fs/f2fs/sdb1/segment_info. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-30f2fs: recover date requested by fdatasyncJaegeuk Kim
In order to support SQLite that uses fdatasync instead of fsync, we should guarantee the data requested by fdatasync can be recovered after sudden-power- off. So, let's remove the fdatasync condition in f2fs_sync_file. Otherwise, we can restore the data after sudden-power-off due to nonexistence of any fsync mark'ed node blocks. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-08f2fs: fix readdir incorrectnessJaegeuk Kim
In the previous Al Viro's readdir patch set, there occurs a bug when running xfstest: 006 as follows. [Error output] alpha size = 4, name length = 6, total files = 4096, nproc=1 1023 files created rm: cannot remove `/mnt/f2fs/permname.15150/a': Directory not empty [Correct output] alpha size = 4, name length = 6, total files = 4096, nproc=1 4097 files created This bug is due to the misupdate of directory position in ctx. So, this patch fixes this. [AV: fixed a braino] CC: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-07-02Merge tag 'for-f2fs-3.11' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs Pull f2fs updates from Jaegeuk Kim: "This patch-set includes the following major enhancement patches: - remount_fs callback function - restore parent inode number to enhance the fsync performance - xattr security labels - reduce the number of redundant lock/unlock data pages - avoid frequent write_inode calls The other minor bug fixes are as follows. - endian conversion bugs - various bugs in the roll-forward recovery routine" * tag 'for-f2fs-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (56 commits) f2fs: fix to recover i_size from roll-forward f2fs: remove the unused argument "sbi" of func destroy_fsync_dnodes() f2fs: remove reusing any prefree segments f2fs: code cleanup and simplify in func {find/add}_gc_inode f2fs: optimize the init_dirty_segmap function f2fs: fix an endian conversion bug detected by sparse f2fs: fix crc endian conversion f2fs: add remount_fs callback support f2fs: recover wrong pino after checkpoint during fsync f2fs: optimize do_write_data_page() f2fs: make locate_dirty_segment() as static f2fs: remove unnecessary parameter "offset" from __add_sum_entry() f2fs: avoid freqeunt write_inode calls f2fs: optimise the truncate_data_blocks_range() range f2fs: use the F2FS specific flags in f2fs_ioctl() f2fs: sync dir->i_size with its block allocation f2fs: fix i_blocks translation on various types of files f2fs: set sb->s_fs_info before calling parse_options() f2fs: support xattr security labels f2fs: fix iget/iput of dir during recovery ...
2013-07-02Merge tag 'ext4_for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 update from Ted Ts'o: "Lots of bug fixes, cleanups and optimizations. In the bug fixes category, of note is a fix for on-line resizing file systems where the block size is smaller than the page size (i.e., file systems 1k blocks on x86, or more interestingly file systems with 4k blocks on Power or ia64 systems.) In the cleanup category, the ext4's punch hole implementation was significantly improved by Lukas Czerner, and now supports bigalloc file systems. In addition, Jan Kara significantly cleaned up the write submission code path. We also improved error checking and added a few sanity checks. In the optimizations category, two major optimizations deserve mention. The first is that ext4_writepages() is now used for nodelalloc and ext3 compatibility mode. This allows writes to be submitted much more efficiently as a single bio request, instead of being sent as individual 4k writes into the block layer (which then relied on the elevator code to coalesce the requests in the block queue). Secondly, the extent cache shrink mechanism, which was introduce in 3.9, no longer has a scalability bottleneck caused by the i_es_lru spinlock. Other optimizations include some changes to reduce CPU usage and to avoid issuing empty commits unnecessarily." * tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (86 commits) ext4: optimize starting extent in ext4_ext_rm_leaf() jbd2: invalidate handle if jbd2_journal_restart() fails ext4: translate flag bits to strings in tracepoints ext4: fix up error handling for mpage_map_and_submit_extent() jbd2: fix theoretical race in jbd2__journal_restart ext4: only zero partial blocks in ext4_zero_partial_blocks() ext4: check error return from ext4_write_inline_data_end() ext4: delete unnecessary C statements ext3,ext4: don't mess with dir_file->f_pos in htree_dirblock_to_tree() jbd2: move superblock checksum calculation to jbd2_write_superblock() ext4: pass inode pointer instead of file pointer to punch hole ext4: improve free space calculation for inline_data ext4: reduce object size when !CONFIG_PRINTK ext4: improve extent cache shrink mechanism to avoid to burn CPU time ext4: implement error handling of ext4_mb_new_preallocation() ext4: fix corruption when online resizing a fs with 1K block size ext4: delete unused variables ext4: return FIEMAP_EXTENT_UNKNOWN for delalloc extents jbd2: remove debug dependency on debug_fs and update Kconfig help text jbd2: use a single printk for jbd_debug() ...
2013-07-02f2fs: fix to recover i_size from roll-forwardJaegeuk Kim
If user requests many data writes and fsync together, the last updated i_size should be stored to the inode block consistently. But, previous write_end just marks the inode as dirty and doesn't update its metadata into its inode block. After that, fsync just writes the inode block with newly updated data index excluding inode metadata updates. So, this patch introduces write_end in which updates inode block too when the i_size is changed. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-02f2fs: remove the unused argument "sbi" of func destroy_fsync_dnodes()Gu Zheng
As destroy_fsync_dnodes() is a simple list-cleanup func, so delete the unused and unrelated f2fs_sb_info argument of it. Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-02f2fs: remove reusing any prefree segmentsJaegeuk Kim
This patch removes check_prefree_segments initially designed to enhance the performance by narrowing the range of LBA usage across the whole block device. When allocating a new segment, previous f2fs tries to find proper prefree segments, and then, if finds a segment, it reuses the segment for further data or node block allocation. However, I found that this was totally wrong approach since the prefree segments have several data or node blocks that will be used by the roll-forward mechanism operated after sudden-power-off. Let's assume the following scenario. /* write 8MB with fsync */ for (i = 0; i < 2048; i++) { offset = i * 4096; write(fd, offset, 4KB); fsync(fd); } In this case, naive segment allocation sequence will be like: data segment: x, x+1, x+2, x+3 node segment: y, y+1, y+2, y+3. But, if we can reuse prefree segments, the sequence can be like: data segment: x, x+1, y, y+1 node segment: y, y+1, y+2, y+3. Because, y, y+1, and y+2 became prefree segments one by one, and those are reused by data allocation. After conducting this workload, we should consider how to recover the latest inode with its data. If we reuse the prefree segments such as y or y+1, we lost the old node blocks so that f2fs even cannot start roll-forward recovery. Therefore, I suggest that we should remove reusing prefree segments. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-02f2fs: code cleanup and simplify in func {find/add}_gc_inodeGu Zheng
This patch simplifies list operations in find_gc_inode and add_gc_inode. Just simple code cleanup. Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com> [Jaegeuk Kim: add description] Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-02f2fs: optimize the init_dirty_segmap functionNamjae Jeon
Optimize the while loop condition Since this condition will always be true and while loop will be terminated by the following condition in code: if (segno >= TOTAL_SEGS(sbi)) break; Hence we can replace the while loop condition with while(1) instead of always checking for segno to be less than Total segs. Also we do not need to use TOTAL_SEGS() everytime. We can store this value in a local variable since this value is constant. Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Pankaj Kumar <pankaj.km@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-02f2fs: fix an endian conversion bug detected by sparseJaegeuk Kim
This patch should fix the following bug reported by kbuild test robot. fs/f2fs/recovery.c:233:33: sparse: incorrect type in assignment (different base types) parse warnings: (new ones prefixed by >>) >> recovery.c:233: sparse: incorrect type in assignment (different base types) recovery.c:233: expected unsigned int [unsigned] [assigned] ofs_in_node recovery.c:233: got restricted __le16 [assigned] [usertype] ofs_in_node >> recovery.c:238: sparse: incorrect type in assignment (different base types) recovery.c:238: expected unsigned int [unsigned] ofs_in_node recovery.c:238: got restricted __le16 [assigned] [usertype] ofs_in_node Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-07-02f2fs: fix crc endian conversionJaegeuk Kim
While calculating CRC for the checkpoint block, we use __u32, but when storing the crc value to the disk, we use __le32. Let's fix the inconsistency. Reported-and-Tested-by: Oded Gabbay <ogabbay@advaoptical.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-06-29[readdir] convert f2fsAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>