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Sasha Levin 67f9fd91f9 mm: remove read_cache_page_async() 
This patch removes read_cache_page_async() which wasn't really needed
anywhere and simplifies the code around it a bit.

read_cache_page_async() is useful when we want to read a page into the
cache without waiting for it to complete.  This happens when the
appropriate callback 'filler' doesn't complete its read operation and
releases the page lock immediately, and instead queues a different
completion routine to do that.  This never actually happened anywhere in
the code.

read_cache_page_async() had 3 different callers:

- read_cache_page() which is the sync version, it would just wait for
  the requested read to complete using wait_on_page_read().

- JFFS2 would call it from jffs2_gc_fetch_page(), but the filler
  function it supplied doesn't do any async reads, and would complete
  before the filler function returns - making it actually a sync read.

- CRAMFS would call it using the read_mapping_page_async() wrapper, with
  a similar story to JFFS2 - the filler function doesn't do anything that
  reminds async reads and would always complete before the filler function
  returns.

To sum it up, the code in mm/filemap.c never took advantage of having
read_cache_page_async().  While there are filler callbacks that do async
reads (such as the block one), we always called it with the
read_cache_page().

This patch adds a mandatory wait for read to complete when adding a new
page to the cache, and removes read_cache_page_async() and its wrappers.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2014-04-03 16:21:04 -07:00
..
9p mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
adfs
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affs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
afs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
autofs4 autofs: fix symlinks aren't checked for expiry 2014-01-23 16:36:59 -08:00
befs befs: iget_locked() doesn't return an ERR_PTR 2014-01-25 03:14:38 -05:00
bfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
btrfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
cachefiles fs: cachefiles: use add_to_page_cache_lru() 2014-04-03 16:21:00 -07:00
ceph ceph: fix __dcache_readdir() 2014-02-17 12:37:13 -08:00
cifs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
coda mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
configfs
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cramfs mm: remove read_cache_page_async() 2014-04-03 16:21:04 -07:00
debugfs treewide: Fix typo in Documentation/DocBook 2014-02-19 14:58:17 +01:00
devpts
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dlm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-01-25 11:17:34 -08:00
ecryptfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
efivarfs efivarfs: 'efivarfs_file_write' function reorganization 2014-03-04 16:16:16 +00:00
efs efs: get rid of ->put_super() 2014-01-25 03:13:02 -05:00
exofs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
exportfs
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ext2 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ext3 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ext4 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
f2fs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
fat mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
freevxfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
fscache FS-Cache: Handle removal of unadded object to the fscache_object_list rb tree 2014-02-17 13:47:35 -08:00
fuse mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
gfs2 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
hfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
hfsplus mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
hostfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
hpfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
hppfs
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hugetlbfs mm, hugetlb: unify region structure handling 2014-04-03 16:20:59 -07:00
isofs
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jbd
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jbd2 jbd2: fix use after free in jbd2_journal_start_reserved() 2014-02-17 20:33:01 -05:00
jffs2 mm: remove read_cache_page_async() 2014-04-03 16:21:04 -07:00
jfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
kernfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
lockd lockd: send correct lock when granting a delayed lock. 2014-02-13 14:55:02 -05:00
logfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
minix mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ncpfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
nfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
nfs_common
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nfsd nfsd: fix lost nfserrno() call in nfsd_setattr() 2014-02-18 12:25:57 -05:00
nilfs2 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
nls nls: have register_nls() set ->owner 2014-01-25 03:14:05 -05:00
notify fanotify: move unrelated handling from copy_event_to_user() 2014-04-03 16:20:51 -07:00
ntfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ocfs2 mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
omfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
openpromfs
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proc mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
pstore
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qnx4 qnx4: clean qnx4_fill_super() up 2014-01-25 03:13:03 -05:00
qnx6
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quota quota: provide function to grab quota structure reference 2014-04-03 16:20:54 -07:00
ramfs fs/ramfs: move ramfs_aops to inode.c 2014-01-23 16:36:58 -08:00
reiserfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
romfs romfs: fix returm err while getting inode in fill_super 2014-01-23 16:37:04 -08:00
squashfs
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sysfs Revert "sysfs, driver-core: remove unused {sysfs|device}_schedule_callback_owner()" 2014-03-25 20:54:57 -07:00
sysv mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ubifs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
udf mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
ufs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
xfs mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
Kconfig kernfs: add CONFIG_KERNFS 2014-02-07 16:08:57 -08:00
Kconfig.binfmt
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Makefile kernfs: add CONFIG_KERNFS 2014-02-07 16:08:57 -08:00
aio.c
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anon_inodes.c vfs: Allocate anon_inode_inode in anon_inode_init() 2014-03-27 09:52:54 -07:00
attr.c
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bad_inode.c
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binfmt_aout.c
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binfmt_elf.c fs: binfmt_elf: remove unused defines INTERPRETER_NONE and INTERPRETER_ELF 2014-01-23 16:36:58 -08:00
binfmt_elf_fdpic.c
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binfmt_em86.c
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binfmt_flat.c
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binfmt_misc.c
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binfmt_script.c
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binfmt_som.c
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bio-integrity.c Merge branch 'for-3.15/core' of git://git.kernel.dk/linux-block 2014-04-01 19:19:15 -07:00
bio.c bio: don't write "bio: create slab" messages to syslog 2014-02-18 12:17:47 -08:00
block_dev.c mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
buffer.c Merge branch 'master' into for-next 2014-02-20 14:54:28 +01:00
char_dev.c
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compat.c Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-04-02 12:51:41 -07:00
compat_binfmt_elf.c binfmt_elf: add ELF_HWCAP2 to compat auxv entries 2014-03-04 08:05:21 +00:00
compat_ioctl.c fs/compat: convert to COMPAT_SYSCALL_DEFINE with changing parameter types 2014-03-06 16:30:44 +01:00
coredump.c coredump: make __get_dumpable/get_dumpable inline, kill fs/coredump.h 2014-01-23 16:37:01 -08:00
dcache.c make prepend_name() work correctly when called with negative *buflen 2014-03-23 00:28:40 -04:00
dcookies.c fs/compat: fix lookup_dcookie() parameter handling 2014-01-29 16:22:40 -08:00
direct-io.c fs/direct-io.c: remove redundant comparison 2014-04-03 16:20:57 -07:00
drop_caches.c
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eventfd.c eventfd_ctx_fdget(): use fdget() instead of fget() 2014-01-25 03:13:04 -05:00
eventpoll.c
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exec.c fs/compat: convert to COMPAT_SYSCALL_DEFINE 2014-03-06 16:30:43 +01:00
fcntl.c
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fhandle.c
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file.c Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-03-31 11:05:24 -07:00
file_table.c vfs: atomic f_pos accesses as per POSIX 2014-03-10 11:44:41 -04:00
filesystems.c
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fs-writeback.c bdi: avoid oops on device removal 2014-04-03 16:20:49 -07:00
fs_struct.c
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inode.c mm + fs: store shadow entries in page cache 2014-04-03 16:21:01 -07:00
internal.h
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ioctl.c
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ioprio.c
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libfs.c
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locks.c
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mbcache.c
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mount.h switch mnt_hash to hlist 2014-03-30 19:18:51 -04:00
mpage.c
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namei.c rcuwalk: recheck mount_lock after mountpoint crossing attempts 2014-03-23 00:32:55 -04:00
namespace.c switch mnt_hash to hlist 2014-03-30 19:18:51 -04:00
no-block.c
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open.c vfs: atomic f_pos accesses as per POSIX 2014-03-10 11:44:41 -04:00
pipe.c fs/pipe.c: skip file_update_time on frozen fs 2014-01-23 16:37:00 -08:00
pnode.c switch mnt_hash to hlist 2014-03-30 19:18:51 -04:00
pnode.h switch mnt_hash to hlist 2014-03-30 19:18:51 -04:00
posix_acl.c fs: get_acl() must be allowed to return EOPNOTSUPP 2014-02-03 17:12:37 -05:00
proc_namespace.c fs/proc_namespace.c: simplify testing nsp and nsp->mnt_ns 2014-01-23 16:37:02 -08:00
read_write.c Merge branch 'compat' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2014-03-31 14:32:17 -07:00
readdir.c
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select.c
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seq_file.c
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signalfd.c
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splice.c fuse: fix pipe_buf_operations 2014-01-22 19:36:57 +01:00
stack.c
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stat.c
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statfs.c
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super.c fs/super.c: sync ro remount after blocking writers 2014-01-31 14:29:36 -05:00
sync.c Revert "writeback: do not sync data dirtied after sync start" 2014-02-22 02:02:28 +01:00
timerfd.c timerfd: support CLOCK_BOOTTIME clock 2014-01-23 16:57:40 -08:00
utimes.c
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xattr.c
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