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9faac62d40
linux/fs
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Ritesh Harjani 9faac62d40 ext4: optimize file overwrites 
In case if the file already has underlying blocks/extents allocated
then we don't need to start a journal txn and can directly return
the underlying mapping. Currently ext4_iomap_begin() is used by
both DAX & DIO path. We can check if the write request is an
overwrite & then directly return the mapping information.

This could give a significant perf boost for multi-threaded writes
specially random overwrites.
On PPC64 VM with simulated pmem(DAX) device, ~10x perf improvement
could be seen in random writes (overwrite). Also bcoz this optimizes
away the spinlock contention during jbd2 slab cache allocation
(jbd2_journal_handle). On x86 VM, ~2x perf improvement was observed.

Reported-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Link: https://lore.kernel.org/r/88e795d8a4d5cd22165c7ebe857ba91d68d8813e.1600401668.git.riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-18 10:36:58 -04:00
..
9p treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
adfs treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
affs affs: fix basic permission bits to actually work 2020-08-31 12:20:31 +02:00
afs Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-09-03 18:50:48 -07:00
autofs fs: autofs: delete repeated words in comments 2020-08-14 19:56:56 -07:00
befs block: move struct block_device to blk_types.h 2020-06-24 09:16:02 -06:00
bfs
btrfs for-5.9-rc6-tag 2020-09-23 14:32:23 -07:00
cachefiles cachefiles: switch to kernel_write 2020-07-08 08:27:56 +02:00
ceph We have an inode number handling change, prompted by s390x which is 2020-08-28 10:33:04 -07:00
cifs cifs: fix DFS mount with cifsacl/modefromsid 2020-09-06 23:59:53 -05:00
coda
configfs treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
cramfs
crypto mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
debugfs debugfs: Fix module state check condition 2020-09-04 18:12:52 +02:00
devpts
dlm treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ecryptfs mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
efivarfs efi/efivars: Expose RT service availability via efivars abstraction 2020-07-09 10:14:29 +03:00
efs block: move struct block_device to blk_types.h 2020-06-24 09:16:02 -06:00
erofs treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
exfat exfat: retain 'VolumeFlags' properly 2020-08-12 08:31:13 +09:00
exportfs
ext2 ext2: don't update mtime on COW faults 2020-09-05 10:00:05 -07:00
ext4 ext4: optimize file overwrites 2020-10-18 10:36:58 -04:00
f2fs f2fs: Return EOF on unaligned end of file DIO read 2020-09-08 20:31:33 -07:00
fat fat: fix fat_ra_init() for data clusters == 0 2020-08-12 10:58:01 -07:00
freevxfs
fscache Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-06-03 16:27:18 -07:00
fuse fuse: fix the ->direct_IO() treatment of iov_iter 2020-09-17 17:26:56 -04:00
gfs2 Fix memory leak on filesystem withdraw 2020-08-28 10:41:00 -07:00
hfs block: move block-related definitions out of fs.h 2020-06-24 09:16:02 -06:00
hfsplus treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
hostfs
hpfs hpfs: fix warning due to superfluous semicolon 2020-06-06 10:08:17 -07:00
hugetlbfs hugetlbfs: prevent filesystem stacking of hugetlbfs 2020-08-12 10:57:56 -07:00
iomap treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
isofs Remove uninitialized_var() macro for v5.9-rc1 2020-08-04 13:49:43 -07:00
jbd2 jbd2: clean up checksum verification in do_one_pass() 2020-08-19 12:04:35 -04:00
jffs2 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
jfs block: move struct block_device to blk_types.h 2020-06-24 09:16:02 -06:00
kernfs fsnotify: pass dir and inode arguments to fsnotify() 2020-07-27 23:15:48 +02:00
lockd
minix fs/minix: remove expected error message in block_to_path() 2020-08-12 10:58:00 -07:00
nfs NFS client bugfixes for Linux 5.9 2020-09-09 11:14:20 -07:00
nfs_common treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nfsd Fixes: 2020-08-25 18:01:36 -07:00
nilfs2 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nls treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
notify treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ntfs ntfs: fix ntfs_test_inode and ntfs_init_locked_inode function type 2020-08-07 11:33:21 -07:00
ocfs2 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
omfs treewide: Remove uninitialized_var() usage 2020-07-16 12:35:15 -07:00
openpromfs
orangefs orangefs: remove unnecessary assignment to variable ret 2020-08-04 15:01:58 -04:00
overlayfs Remove uninitialized_var() macro for v5.9-rc1 2020-08-04 13:49:43 -07:00
proc mm, oom: make the calculation of oom badness more accurate 2020-08-12 10:57:56 -07:00
pstore treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
qnx4
qnx6 fs: convert mpage_readpages to mpage_readahead 2020-06-02 10:59:07 -07:00
quota treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ramfs
reiserfs \n 2020-08-06 19:28:26 -07:00
romfs romfs: fix uninitialized memory leak in romfs_dev_read() 2020-08-21 09:52:53 -07:00
squashfs squashfs: avoid bio_alloc() failure with 1Mbyte blocks 2020-08-21 09:52:53 -07:00
sysfs RDMA 5.8 merge window pull request 2020-06-05 14:05:57 -07:00
sysv
tracefs
ubifs treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
udf treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ufs treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
unicode
vboxsf Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-09-22 15:08:41 -07:00
verity fs-verity: use smp_load_acquire() for ->i_verity_info 2020-07-21 16:02:41 -07:00
xfs Fixes (2) for 5.9: 2020-09-05 10:04:53 -07:00
zonefs zonefs: add zone-capacity support 2020-08-11 17:42:24 +09:00
aio.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
anon_inodes.c
attr.c
bad_inode.c fs: move the fiemap definitions out of fs.h 2020-06-03 23:16:55 -04:00
binfmt_aout.c
binfmt_elf_fdpic.c Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
binfmt_elf.c kill elf_fpxregs_t 2020-07-27 14:29:23 -04:00
binfmt_em86.c Merge branch 'akpm' (patches from Andrew) 2020-06-04 19:18:29 -07:00
binfmt_flat.c binfmt_flat: revert "binfmt_flat: don't offset the data start" 2020-08-24 08:49:13 +10:00
binfmt_misc.c Merge branch 'akpm' (patches from Andrew) 2020-06-04 19:18:29 -07:00
binfmt_script.c Merge branch 'akpm' (patches from Andrew) 2020-06-04 19:18:29 -07:00
block_dev.c for-5.9/io_uring-20200802 2020-08-03 13:01:22 -07:00
buffer.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
char_dev.c vfs: allow unprivileged whiteout creation 2020-05-14 16:44:23 +02:00
compat_binfmt_elf.c Split the old READ_IMPLIES_EXEC workaround from executable PT_GNU_STACK 2020-06-05 13:45:21 -07:00
compat.c
coredump.c coredump: add %f for executable filename 2020-08-12 10:58:01 -07:00
d_path.c
dax.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
dcache.c vfs: Use sequence counter with associated spinlock 2020-07-29 16:14:27 +02:00
dcookies.c
direct-io.c block: remove the bd_queue field from struct block_device 2020-07-01 08:08:20 -06:00
drop_caches.c
eventfd.c
eventpoll.c fix regression in "epoll: Keep a reference on files added to the check list" 2020-09-02 11:30:48 -04:00
exec.c mm/gup: remove task_struct pointer for all gup code 2020-08-12 10:58:04 -07:00
fcntl.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
fhandle.c
file_table.c Revert "fs: Do not check if there is a fsnotify watcher on pseudo inodes" 2020-06-29 09:40:55 -07:00
file.c Merge branch 'hch.init_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 09:40:34 -07:00
filesystems.c
fs_context.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
fs_parser.c
fs_pin.c
fs_struct.c vfs: Use sequence counter with associated spinlock 2020-07-29 16:14:27 +02:00
fs_types.c
fs-writeback.c fs/fs-writeback.c: adjust dirtytime_interval_handler definition to match prototype 2020-09-19 13:13:39 -07:00
fsopen.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
init.c init: add an init_dup helper 2020-08-04 21:02:38 -04:00
inode.c AFS Changes 2020-06-05 16:26:36 -07:00
internal.h Merge branch 'hch.init_path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 09:40:34 -07:00
io_uring.c io_uring-5.9-2020-09-25 2020-09-26 11:13:51 -07:00
io-wq.c io-wq: fix hang after cancelling pending hashed work 2020-08-23 11:38:50 -06:00
io-wq.h io_uring/io-wq: move RLIMIT_FSIZE to io-wq 2020-07-24 13:00:44 -06:00
ioctl.c fs: remove ksys_ioctl 2020-07-31 08:16:01 +02:00
Kconfig tmpfs: support 64-bit inums per-sb 2020-08-07 11:33:24 -07:00
Kconfig.binfmt treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
libfs.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
locks.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
Makefile init: add an init_mount helper 2020-07-31 08:17:51 +02:00
mbcache.c
mount.h proc/mounts: add cursor 2020-05-14 16:44:24 +02:00
mpage.c fs: convert mpage_readpages to mpage_readahead 2020-06-02 10:59:07 -07:00
namei.c exec: restore EACCES of S_ISDIR execve() 2020-08-14 19:56:56 -07:00
namespace.c Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 21:03:25 -07:00
no-block.c
nsfs.c nsproxy: attach to namespaces via pidfds 2020-05-13 11:41:22 +02:00
open.c exec: move S_ISREG() check earlier 2020-08-12 10:58:01 -07:00
pipe.c Notifications over pipes + Keyring notifications 2020-06-13 09:56:21 -07:00
pnode.c
pnode.h
posix_acl.c vfs: clean up posix_acl_permission() logic aroudn MAY_NOT_BLOCK 2020-06-08 11:04:19 -07:00
proc_namespace.c Merge branch 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2020-06-04 13:54:34 -07:00
read_write.c initrd: switch initrd loading to struct file based APIs 2020-07-30 08:22:47 +02:00
readdir.c fs: remove ksys_getdents64 2020-07-31 08:16:00 +02:00
select.c pselect6() and friends: take handling the combined 6th/7th args into helper 2020-05-29 19:10:42 -04:00
seq_file.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
signalfd.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
splice.c Notifications over pipes + Keyring notifications 2020-06-13 09:56:21 -07:00
stack.c
stat.c New code for 5.8: 2020-06-02 19:45:12 -07:00
statfs.c
super.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-06-10 16:09:11 -07:00
sync.c overlayfs update for 5.8 2020-06-09 15:40:50 -07:00
timerfd.c
userfaultfd.c A set of locking fixes and updates: 2020-08-10 19:07:44 -07:00
utimes.c fs: expose utimes_common 2020-07-31 08:16:01 +02:00
xattr.c xattr: add a function to check if a namespace is supported 2020-07-13 17:27:03 -04:00