diff options
| author | Miklos Szeredi <mszeredi@suse.cz> | 2012-08-10 17:40:12 +0200 |
|---|---|---|
| committer | John Rigby <john.rigby@linaro.org> | 2012-08-15 23:46:01 -0600 |
| commit | f67ea26fb4a2adc71185d91b3c36d52a3c35b553 (patch) | |
| tree | f589921fae0049c176994c293367aeb200075da6 /Documentation | |
| parent | 1d563db6e30f8aad74a4cb680db65fc2b581af3a (diff) | |
vfs: add i_op->open()
Add a new inode operation i_op->open(). This is for stacked
filesystems that want to return a struct file from a different
filesystem.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/filesystems/Locking | 2 | ||||
| -rw-r--r-- | Documentation/filesystems/vfs.txt | 7 |
2 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index 0f103e39b4f..d222b6a37ff 100644 --- a/Documentation/filesystems/Locking +++ b/Documentation/filesystems/Locking @@ -64,6 +64,7 @@ prototypes: int (*atomic_open)(struct inode *, struct dentry *, struct file *, unsigned open_flag, umode_t create_mode, int *opened); + int (*dentry_open)(struct dentry *, struct file *, const struct cred *); locking rules: all may block @@ -92,6 +93,7 @@ removexattr: yes fiemap: no update_time: no atomic_open: yes +open: no Additionally, ->rmdir(), ->unlink() and ->rename() have ->i_mutex on victim. diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 065aa2dc083..f53d93c4f7c 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -367,6 +367,7 @@ struct inode_operations { int (*atomic_open)(struct inode *, struct dentry *, struct file *, unsigned open_flag, umode_t create_mode, int *opened); + int (*dentry_open)(struct dentry *, struct file *, const struct cred *); }; Again, all methods are called without any locks being held, unless @@ -696,6 +697,12 @@ struct address_space_operations { but instead uses bmap to find out where the blocks in the file are and uses those addresses directly. + dentry_open: this is an alternative to f_op->open(), the difference is that + this method may open a file not necessarily originating from the same + filesystem as the one i_op->open() was called on. It may be + useful for stacking filesystems which want to allow native I/O directly + on underlying files. + invalidatepage: If a page has PagePrivate set, then invalidatepage will be called when part or all of the page is to be removed |