J. Bruce Fields d891eedbc3 fs/dcache: allow d_obtain_alias() to return unhashed dentries ... Without this patch, inodes are not promptly freed on last close of an unlinked file by an nfs client: client$ mount -tnfs4 server:/export/ /mnt/ client$ tail -f /mnt/FOO ... server$ df -i /export server$ rm /export/FOO (^C the tail -f) server$ df -i /export server$ echo 2 >/proc/sys/vm/drop_caches server$ df -i /export the df's will show that the inode is not freed on the filesystem until the last step, when it could have been freed after killing the client's tail -f. On-disk data won't be deallocated either, leading to possible spurious ENOSPC. This occurs because when the client does the close, it arrives in a compound with a putfh and a close, processed like: - putfh: look up the filehandle.  The only alias found for the inode will be DCACHE_UNHASHED alias referenced by the filp this, so it creates a new DCACHE_DISCONECTED dentry and returns that instead. - close: closes the existing filp, which is destroyed immediately by dput() since it's DCACHE_UNHASHED. - end of the compound: release the reference to the current filehandle, and dput() the new DCACHE_DISCONECTED dentry, which gets put on the unused list instead of being destroyed immediately. Nick Piggin suggested fixing this by allowing d_obtain_alias to return the unhashed dentry that is referenced by the filp, instead of making it create a new dentry. Leave __d_find_alias() alone to avoid changing behavior of other callers. Also nfsd doesn't need all the checks of __d_find_alias(); any dentry, hashed or unhashed, disconnected or not, should work. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>		2011-03-10 05:18:54 -05:00
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9p
adfs
affs
afs
autofs4
befs
bfs
btrfs
cachefiles
ceph	ceph: fix d_revalidate oopsen on NFS exports	2011-03-10 03:44:05 -05:00
cifs
coda
configfs
cramfs
debugfs
devpts
dlm
ecryptfs
efs
exofs
exportfs
ext2
ext3
ext4
fat	fat: fix d_revalidate oopsen on NFS exports	2011-03-10 03:45:49 -05:00
freevxfs
fscache
fuse	fuse: fix d_revalidate oopsen on NFS exports	2011-03-10 03:44:31 -05:00
gfs2	gfs2: fix d_revalidate oopsen on NFS exports	2011-03-10 03:44:48 -05:00
hfs
hfsplus
hostfs
hpfs
hppfs
hugetlbfs
isofs
jbd
jbd2
jffs2
jfs	jfs: fix d_revalidate oopsen on NFS exports	2011-03-10 03:45:28 -05:00
lockd
logfs
minix
ncpfs
nfs
nfs_common
nfsd
nilfs2
nls
notify
ntfs
ocfs2	ocfs2: fix d_revalidate oopsen on NFS exports	2011-03-10 03:45:07 -05:00
omfs
openpromfs
partitions
proc
qnx4
quota
ramfs
reiserfs
romfs
squashfs
sysfs
sysv
ubifs
udf
ufs
xfs
aio.c
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c
binfmt_elf.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c
block_dev.c
buffer.c
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c
compat.c
dcache.c	fs/dcache: allow d_obtain_alias() to return unhashed dentries	2011-03-10 05:18:54 -05:00
dcookies.c
direct-io.c
drop_caches.c
eventfd.c
eventpoll.c
exec.c
fcntl.c
fifo.c
file_table.c
file.c
filesystems.c
fs_struct.c
fs-writeback.c
generic_acl.c
inode.c
internal.h
ioctl.c
ioprio.c
Kconfig
Kconfig.binfmt
libfs.c
locks.c
Makefile
mbcache.c
mpage.c
namei.c
namespace.c
nfsctl.c
no-block.c
open.c	Check for immutable/append flag in fallocate path	2011-03-10 04:22:15 -05:00
pipe.c
pnode.c
pnode.h
posix_acl.c
read_write.c
read_write.h
readdir.c
select.c
seq_file.c
signalfd.c
splice.c
stack.c
stat.c
statfs.c
super.c
sync.c
timerfd.c
utimes.c
xattr_acl.c
xattr.c