Miklos Szeredi d101a12595 fs: add file_dentry() ... This series fixes bugs in nfs and ext4 due to 4bacc9c923 ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay"). Regular files opened on overlayfs will result in the file being opened on the underlying filesystem, while f_path points to the overlayfs mount/dentry. This confuses filesystems which get the dentry from struct file and assume it's theirs. Add a new helper, file_dentry() [*], to get the filesystem's own dentry from the file. This checks file->f_path.dentry->d_flags against DCACHE_OP_REAL, and returns file->f_path.dentry if DCACHE_OP_REAL is not set (this is the common, non-overlayfs case). In the uncommon case it will call into overlayfs's ->d_real() to get the underlying dentry, matching file_inode(file). The reason we need to check against the inode is that if the file is copied up while being open, d_real() would return the upper dentry, while the open file comes from the lower dentry. [*] If possible, it's better simply to use file_inode() instead. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Tested-by: Goldwyn Rodrigues <rgoldwyn@suse.com> Reviewed-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: <stable@vger.kernel.org> # v4.2 Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Daniel Axtens <dja@axtens.net>		2016-03-26 16:14:37 -04:00
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acpi	…
asm-generic	Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-20 19:08:56 -07:00
clocksource	…
crypto	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2016-03-17 11:33:45 -07:00
drm	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2016-03-21 13:48:00 -07:00
dt-bindings	IOMMU Updates for Linux v4.6	2016-03-22 11:57:43 -07:00
keys	…
kvm	…
linux	fs: add file_dentry()	2016-03-26 16:14:37 -04:00
math-emu	…
media	Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm	2016-03-19 16:31:54 -07:00
memory	…
misc	…
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2016-03-19 10:05:34 -07:00
pcmcia	…
ras	…
rdma	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2016-03-19 10:05:34 -07:00
rxrpc	…
scsi	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2016-03-17 11:22:54 -07:00
soc	IOMMU Updates for Linux v4.6	2016-03-22 11:57:43 -07:00
sound	…
target	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2016-03-22 12:41:14 -07:00
trace	Merge tag 'for-f2fs-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs	2016-03-21 11:03:02 -07:00
uapi	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2016-03-22 12:41:14 -07:00
video	…
xen	…
Kbuild	…