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bc6385dab1
linux/fs/ext4
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Ritesh Harjani bc6385dab1 ext4: Move to shared i_rwsem even without dioread_nolock mount opt 
We were using shared locking only in case of dioread_nolock mount option in case
of DIO overwrites. This mount condition is not needed anymore with current code,
since:-

1. No race between buffered writes & DIO overwrites. Since buffIO writes takes
exclusive lock & DIO overwrites will take shared locking. Also DIO path will
make sure to flush and wait for any dirty page cache data.

2. No race between buffered reads & DIO overwrites, since there is no block
allocation that is possible with DIO overwrites. So no stale data exposure
should happen. Same is the case between DIO reads & DIO overwrites.

3. Also other paths like truncate is protected, since we wait there for any DIO
in flight to be over.

Reviewed-by: Jan Kara <jack@suse.cz>
Tested-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Link: https://lore.kernel.org/r/20191212055557.11151-4-riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2019-12-22 23:57:27 -05:00
..
acl.c ext4: compare old and new mode before setting update_mode flag 2018-12-10 00:22:38 -05:00
acl.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
balloc.c ext4: clean up kerneldoc warnigns when building with W=1 2019-06-19 16:30:03 -04:00
bitmap.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
block_validity.c ext4: use RCU API in debug_print_tree 2019-12-15 21:41:04 -05:00
dir.c ext4: optimize __ext4_check_dir_entry() 2019-12-14 17:23:14 -05:00
ext4_extents.h ext4: adjust reserved cluster count when removing extents 2018-10-01 14:25:08 -04:00
ext4_jbd2.c ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
ext4_jbd2.h ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
ext4.h This merge window saw the the following new featuers added to ext4: 2019-11-30 10:53:02 -08:00
extents_status.c ext4: use percpu_counters for extent_status cache hits/misses 2019-08-28 11:19:23 -04:00
extents_status.h ext4: use percpu_counters for extent_status cache hits/misses 2019-08-28 11:19:23 -04:00
extents.c Merge branch 'mb/dio' into master 2019-11-05 16:21:09 -05:00
file.c ext4: Move to shared i_rwsem even without dioread_nolock mount opt 2019-12-22 23:57:27 -05:00
fsmap.c ext4: fix miscellaneous sparse warnings 2019-05-12 04:49:47 -04:00
fsmap.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
fsync.c ext4: update ext4_sync_file() to not use __generic_file_fsync() 2019-11-05 11:31:40 -05:00
hash.c ext4: fix kernel oops caused by spurious casefold flag 2019-09-03 01:43:17 -04:00
ialloc.c ext4: reserve revoke credits in __ext4_new_inode 2019-12-14 17:47:13 -05:00
indirect.c ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
inline.c ext4: set error return correctly when ext4_htree_store_dirent fails 2019-08-12 14:29:38 -04:00
inode-test.c fs/ext4/inode-test: Fix inode test on 32 bit platforms. 2019-12-09 11:15:44 -07:00
inode.c Ext4 bug fixes (including a regression fix) for 5.5 2019-12-22 10:41:48 -08:00
ioctl.c fs: compat_ioctl: move FITRIM emulation into file systems 2019-10-23 17:23:46 +02:00
Kconfig ext4: add kunit test for decoding extended timestamps 2019-10-23 10:28:23 -06:00
Makefile ext4: add kunit test for decoding extended timestamps 2019-10-23 10:28:23 -06:00
mballoc.c ext4: clean up kerneldoc warnigns when building with W=1 2019-06-19 16:30:03 -04:00
mballoc.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
migrate.c ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
mmp.c ext4: don't mark mmp buffer head dirty 2018-09-15 17:11:25 -04:00
move_extent.c ext4: use jbd2_inode dirty range scoping 2019-06-20 17:26:26 -04:00
namei.c ext4: fix unused-but-set-variable warning in ext4_add_entry() 2019-12-21 21:00:53 -05:00
page-io.c ext4: bio_alloc with __GFP_DIRECT_RECLAIM never fails 2019-11-14 22:19:11 -05:00
readpage.c ext4: bio_alloc with __GFP_DIRECT_RECLAIM never fails 2019-11-14 22:19:11 -05:00
resize.c ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
super.c Ext4 bug fixes (including a regression fix) for 5.5 2019-12-22 10:41:48 -08:00
symlink.c ext4: switch to fscrypt_get_symlink() 2018-01-11 22:10:40 -05:00
sysfs.c ext4: add basic fs-verity support 2019-08-12 19:33:50 -07:00
truncate.h ext4: handle layout changes to pinned DAX mappings 2018-07-29 17:00:22 -04:00
verity.c ext4: add basic fs-verity support 2019-08-12 19:33:50 -07:00
xattr_security.c ext4: use XATTR_CREATE in ext4_initxattrs() 2018-05-10 11:52:14 -04:00
xattr_trusted.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xattr_user.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xattr.c ext4: Reserve revoke credits for freed blocks 2019-11-05 16:00:49 -05:00
xattr.h ext4: add extra checks to ext4_xattr_block_get() 2018-03-30 20:04:11 -04:00