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Christoph Hellwig bd5fe6c5eb fs: kill i_alloc_sem 
i_alloc_sem is a rather special rw_semaphore.  It's the last one that may
be released by a non-owner, and it's write side is always mirrored by
real exclusion.  It's intended use it to wait for all pending direct I/O
requests to finish before starting a truncate.

Replace it with a hand-grown construct:

 - exclusion for truncates is already guaranteed by i_mutex, so it can
   simply fall way
 - the reader side is replaced by an i_dio_count member in struct inode
   that counts the number of pending direct I/O requests.  Truncate can't
   proceed as long as it's non-zero
 - when i_dio_count reaches non-zero we wake up a pending truncate using
   wake_up_bit on a new bit in i_flags
 - new references to i_dio_count can't appear while we are waiting for
   it to read zero because the direct I/O count always needs i_mutex
   (or an equivalent like XFS's i_iolock) for starting a new operation.

This scheme is much simpler, and saves the space of a spinlock_t and a
struct list_head in struct inode (typically 160 bits on a non-debug 64-bit
system).

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
 		2011-07-20 20:47:46 -04:00
..
9p no need to check for LOOKUP_OPEN in ->create() instances 2011-07-20 01:43:56 -04:00
adfs Fix common misspellings 2011-03-31 11:26:23 -03:00
affs affs: remove unnecessary dentry_unhash on rmdir, dir rename 2011-05-28 01:02:53 -04:00
afs ->permission() sanitizing: don't pass flags to ->permission() 2011-07-20 01:43:24 -04:00
autofs4 autofs4: bogus dentry_unhash() added in ->unlink() 2011-05-30 01:50:53 -04:00
befs Fix common misspellings 2011-03-31 11:26:23 -03:00
bfs bfs: remove unnecessary dentry_unhash on dir rename 2011-05-28 01:02:50 -04:00
btrfs make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
cachefiles kill useless checks for sb->s_op == NULL 2011-07-20 01:44:21 -04:00
ceph ceph: LOOKUP_OPEN is set only when it's the last component 2011-07-20 01:43:59 -04:00
cifs cifs_lookup(): LOOKUP_OPEN is set only on the last component 2011-07-20 01:44:00 -04:00
coda ->permission() sanitizing: don't pass flags to ->permission() 2011-07-20 01:43:24 -04:00
configfs configfs: remove unnecessary dentry_unhash on rmdir, dir rename 2011-05-28 01:02:54 -04:00
cramfs cramfs: get_cramfs_inode() returns ERR_PTR() on failure 2011-07-17 23:22:02 -04:00
debugfs debugfs: move to new strtobool 2011-05-19 16:55:28 +09:30
devpts fs/devpts/inode.c: correctly check d_alloc_name() return code in devpts_pty_new() 2011-03-22 17:44:17 -07:00
dlm Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 2011-05-26 13:19:00 -07:00
ecryptfs don't pass nameidata to vfs_create() from ecryptfs_create() 2011-07-20 01:43:54 -04:00
efs make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
exofs make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
exportfs vfs: Add open by file handle support 2011-03-15 02:21:44 -04:00
ext2 make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
ext3 make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
ext4 ext4: Rewrite ext4_page_mkwrite() to use generic helpers 2011-07-20 20:47:45 -04:00
fat fat: remove i_alloc_sem abuse 2011-07-20 20:47:44 -04:00
freevxfs treewide: fix a few typos in comments 2011-05-10 10:16:21 +02:00
fscache FS-Cache: Add a helper to bulk uncache pages on an inode 2011-07-07 13:21:56 -07:00
fuse no need to check for LOOKUP_OPEN in ->create() instances 2011-07-20 01:43:56 -04:00
gfs2 ->permission() sanitizing: don't pass flags to ->permission() 2011-07-20 01:43:24 -04:00
hfs hfs: remove unnecessary dentry_unhash on rmdir, dir rename 2011-05-28 01:02:52 -04:00
hfsplus hfsplus: Fix double iput of the same inode in hfsplus_fill_super() 2011-06-30 13:38:39 +02:00
hostfs ->permission() sanitizing: don't pass flags to ->permission() 2011-07-20 01:43:24 -04:00
hpfs ->permission() sanitizing: don't pass flags to generic_permission() 2011-07-20 01:43:22 -04:00
hppfs hppfs_lookup(): don't open-code lookup_one_len() 2011-07-17 23:22:48 -04:00
hugetlbfs mm: don't access vm_flags as 'int' 2011-05-26 09:20:31 -07:00
isofs make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
jbd jbd: Fix comment to match the code in journal_start() 2011-05-24 00:27:53 +02:00
jbd2 jbd2: Fix oops in jbd2_journal_remove_journal_head() 2011-06-13 15:38:22 -04:00
jffs2 make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
jfs make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
lockd NLM: Don't hang forever on NLM unlock requests 2011-06-15 11:24:27 -04:00
logfs make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
minix minix: remove unnecessary dentry_unhash on rmdir, dir rename 2011-05-28 01:02:54 -04:00
ncpfs ncpfs: fix rename over directory with dangling references 2011-05-28 01:02:53 -04:00
nfs switch vfs_path_lookup() to struct path 2011-07-20 01:44:14 -04:00
nfs_common Fix common misspellings 2011-03-31 11:26:23 -03:00
nfsd nfsd4_list_rec_dir(): don't bother with reopening rec_file 2011-07-20 01:44:23 -04:00
nilfs2 make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
nls
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notify Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6 2011-04-07 11:14:49 -07:00
ntfs fs: kill i_alloc_sem 2011-07-20 20:47:46 -04:00
ocfs2 fs: kill i_alloc_sem 2011-07-20 20:47:46 -04:00
omfs Remove unneeded version.h includes from fs/ 2011-06-24 08:34:22 -07:00
openpromfs
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partitions Revert "block: Remove extra discard_alignment from hd_struct." 2011-05-30 07:42:51 +02:00
proc ->permission() sanitizing: don't pass flags to ->permission() 2011-07-20 01:43:24 -04:00
pstore pstore: fix pstore filesystem mount/remount issue 2011-05-16 11:05:00 -07:00
qnx4 block: remove per-queue plugging 2011-03-10 08:52:07 +01:00
quota vmscan: change shrinker API by passing shrink_control struct 2011-05-25 08:39:26 -07:00
ramfs ramfs: fix memleak on no-mmu arch 2011-04-14 16:06:56 -07:00
reiserfs fs: kill i_alloc_sem 2011-07-20 20:47:46 -04:00
romfs romfs: fix romfs_get_unmapped_area() argument check 2011-06-27 18:00:12 -07:00
squashfs make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
sysfs ->permission() sanitizing: don't pass flags to ->permission() 2011-07-20 01:43:24 -04:00
sysv sysv: remove unnecessary dentry_unhash from rmdir, dir rename 2011-05-28 01:02:50 -04:00
ubifs ubifs: dereferencing an ERR_PTR in ubifs_mount() 2011-06-20 10:42:34 -04:00
udf switch udf_ioctl() to inode_permission() 2011-07-20 01:43:07 -04:00
ufs make d_splice_alias(ERR_PTR(err), dentry) = ERR_PTR(err) 2011-07-20 01:44:26 -04:00
xfs xfs: make use of new shrinker callout for the inode cache 2011-07-20 20:47:42 -04:00
Kconfig Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2011-05-26 09:52:14 -07:00
Kconfig.binfmt
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Makefile Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6 2011-03-16 19:01:29 -07:00
aio.c Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block 2011-03-24 10:16:26 -07:00
anon_inodes.c sanitize vfsmount refcounting changes 2011-01-16 13:47:07 -05:00
attr.c fs: kill i_alloc_sem 2011-07-20 20:47:46 -04:00
bad_inode.c ->permission() sanitizing: don't pass flags to ->permission() 2011-07-20 01:43:24 -04:00
binfmt_aout.c
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binfmt_elf.c consolidate BINPRM_FLAGS_ENFORCE_NONDUMP handling 2011-07-20 01:43:10 -04:00
binfmt_elf_fdpic.c consolidate BINPRM_FLAGS_ENFORCE_NONDUMP handling 2011-07-20 01:43:10 -04:00
binfmt_em86.c
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binfmt_flat.c CRED: Fix load_flat_shared_library() to initialise bprm correctly 2011-05-03 10:10:51 +10:00
binfmt_misc.c consolidate BINPRM_FLAGS_ENFORCE_NONDUMP handling 2011-07-20 01:43:10 -04:00
binfmt_script.c
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binfmt_som.c
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bio-integrity.c block: Require subsystems to explicitly allocate bio_set integrity mempool 2011-03-17 11:11:05 +01:00
bio.c block: improve the bio_add_page() and bio_add_pc_page() descriptions 2011-05-28 14:44:46 +02:00
block_dev.c block: use the passed in @bdev when claiming if partno is zero 2011-06-13 12:45:48 +02:00
buffer.c vfs: Fix data corruption after failed write in __block_write_begin() 2011-06-16 11:44:46 -04:00
char_dev.c
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compat.c exec: unify do_execve/compat_do_execve code 2011-04-09 15:53:56 +02:00
compat_binfmt_elf.c
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compat_ioctl.c
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dcache.c superblock: introduce per-sb cache shrinker infrastructure 2011-07-20 20:47:10 -04:00
dcookies.c oprofile, dcookies: Fix possible circular locking dependency 2011-05-31 16:33:35 +02:00
direct-io.c fs: kill i_alloc_sem 2011-07-20 20:47:46 -04:00
drop_caches.c vmscan: change shrinker API by passing shrink_control struct 2011-05-25 08:39:26 -07:00
eventfd.c Docbook: add fs/eventfd.c and fix typos in it 2011-02-21 15:07:04 -08:00
eventpoll.c Fix common misspellings 2011-03-31 11:26:23 -03:00
exec.c consolidate BINPRM_FLAGS_ENFORCE_NONDUMP handling 2011-07-20 01:43:10 -04:00
fcntl.c userns: rename is_owner_or_cap to inode_owner_or_capable 2011-03-23 19:47:13 -07:00
fhandle.c fs/fhandle.c: add <linux/personality.h> for ia64 2011-04-14 16:06:56 -07:00
fifo.c Filesystem: fifo: Fixed coding style issue. 2011-03-21 00:16:09 -04:00
file.c vfs: avoid large kmalloc()s for the fdtable 2011-04-28 11:28:20 -07:00
file_table.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2011-03-16 13:26:17 -07:00
filesystems.c fs: synchronize_rcu when unregister_filesystem success not failure 2011-04-17 10:42:01 -07:00
fs-writeback.c superblock: move pin_sb_for_writeback() to fs/super.c 2011-07-20 01:44:38 -04:00
fs_struct.c sanitize vfsmount refcounting changes 2011-01-16 13:47:07 -05:00
generic_acl.c ->permission() sanitizing: don't pass flags to ->check_acl() 2011-07-20 01:43:21 -04:00
inode.c fs: kill i_alloc_sem 2011-07-20 20:47:46 -04:00
internal.h superblock: move pin_sb_for_writeback() to fs/super.c 2011-07-20 01:44:38 -04:00
ioctl.c vfs: cleanup do_vfs_ioctl() 2011-03-21 00:16:08 -04:00
ioprio.c
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libfs.c Make ->d_sb assign-once and always non-NULL 2011-07-20 01:44:17 -04:00
locks.c fs: fix lock initialization 2011-07-06 10:41:13 -07:00
mbcache.c vmscan: change shrinker API by passing shrink_control struct 2011-05-25 08:39:26 -07:00
mpage.c mm/fs: add hooks to support cleancache 2011-05-26 10:01:43 -06:00
namei.c VFS: Fixup kerneldoc for generic_permission() 2011-07-20 20:47:43 -04:00
namespace.c fs/namespace.c: bound mount propagation fix 2011-05-26 07:26:44 -04:00
nfsctl.c open-style analog of vfs_path_lookup() 2011-03-14 09:15:28 -04:00
no-block.c
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open.c fs: Use BUG_ON(!mnt) at dentry_open(). 2011-03-21 01:10:41 -04:00
pipe.c Fix broken "pipe: use event aware wakeups" optimization 2011-01-20 16:21:59 -08:00
pnode.c
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pnode.h
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posix_acl.c NFS: Prevent memory allocation failure in nfsacl_encode() 2011-01-25 15:24:47 -05:00
read_write.c
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read_write.h
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readdir.c
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select.c select: remove unused MAX_SELECT_SECONDS 2011-03-21 00:16:08 -04:00
seq_file.c
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signalfd.c
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splice.c splice: add wakeup_pipe_readers() 2011-05-23 19:58:53 +02:00
stack.c
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stat.c readlinkat(), fchownat() and fstatat() with empty relative pathnames 2011-03-15 02:21:45 -04:00
statfs.c clean statfs-like syscalls up 2011-03-14 09:15:28 -04:00
super.c vfs: increase shrinker batch size 2011-07-20 20:47:41 -04:00
sync.c Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block 2011-03-24 10:16:26 -07:00
timerfd.c timerfd: Fix wakeup of processes when timer is cancelled on clock change 2011-06-14 11:46:14 +02:00
utimes.c userns: rename is_owner_or_cap to inode_owner_or_capable 2011-03-23 19:47:13 -07:00
xattr.c Cache xattr security drop check for write v2 2011-05-28 12:02:09 -04:00
xattr_acl.c
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