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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-13 16:55:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-13 16:55:41 -0700 |
| commit | 48023102b7078a6674516b1fe0d639669336049d (patch) | |
| tree | b957aa914b39e8544936d9fbccb83c5632cc6b73 /fs/exportfs/expfs.c | |
| parent | ba2b137d10bafc3cc514e52172b549e64a5402fb (diff) | |
| parent | 16149013f8391d3bd7bcbcbe3bfd2fd06ba110e4 (diff) | |
Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull overlayfs updates from Miklos Szeredi:
"In addition to bug fixes and cleanups there are two new features from
Amir:
- Consistent inode number support for the case when layers are not
all on the same filesystem (feature is dubbed "xino").
- Optimize overlayfs file handle decoding. This one touches the
exportfs interface to allow detecting the disconnected directory
case"
* 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
ovl: update documentation w.r.t "xino" feature
ovl: add support for "xino" mount and config options
ovl: consistent d_ino for non-samefs with xino
ovl: consistent i_ino for non-samefs with xino
ovl: constant st_ino for non-samefs with xino
ovl: allocate anon bdev per unique lower fs
ovl: factor out ovl_map_dev_ino() helper
ovl: cleanup ovl_update_time()
ovl: add WARN_ON() for non-dir redirect cases
ovl: cleanup setting OVL_INDEX
ovl: set d->is_dir and d->opaque for last path element
ovl: Do not check for redirect if this is last layer
ovl: lookup in inode cache first when decoding lower file handle
ovl: do not try to reconnect a disconnected origin dentry
ovl: disambiguate ovl_encode_fh()
ovl: set lower layer st_dev only if setting lower st_ino
ovl: fix lookup with middle layer opaque dir and absolute path redirects
ovl: Set d->last properly during lookup
ovl: set i_ino to the value of st_ino for NFS export
Diffstat (limited to 'fs/exportfs/expfs.c')
| -rw-r--r-- | fs/exportfs/expfs.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c index 329a5d103846..645158dc33f1 100644 --- a/fs/exportfs/expfs.c +++ b/fs/exportfs/expfs.c @@ -435,6 +435,15 @@ struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid, if (IS_ERR_OR_NULL(result)) return ERR_PTR(-ESTALE); + /* + * If no acceptance criteria was specified by caller, a disconnected + * dentry is also accepatable. Callers may use this mode to query if + * file handle is stale or to get a reference to an inode without + * risking the high overhead caused by directory reconnect. + */ + if (!acceptable) + return result; + if (d_is_dir(result)) { /* * This request is for a directory. |