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authorMiklos Szeredi <mszeredi@suse.cz>2012-06-05 15:10:17 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-14 16:33:04 +0400
commitd18e9008c377dc6a6d2166a6840bf3a23a5867fd (patch)
tree6bbb29aea7e931b603bd4cea3cc74a0eda7b6379 /fs/internal.h
parent54ef487241e863a6046536ac5b1fcd5d7cde86e5 (diff)
vfs: add i_op->atomic_open()
Add a new inode operation which is called on the last component of an open. Using this the filesystem can look up, possibly create and open the file in one atomic operation. If it cannot perform this (e.g. the file type turned out to be wrong) it may signal this by returning NULL instead of an open struct file pointer. i_op->atomic_open() is only called if the last component is negative or needs lookup. Handling cached positive dentries here doesn't add much value: these can be opened using f_op->open(). If the cached file turns out to be invalid, the open can be retried, this time using ->atomic_open() with a fresh dentry. For now leave the old way of using open intents in lookup and revalidate in place. This will be removed once all the users are converted. David Howells noticed that if ->atomic_open() opens the file but does not create it, handle_truncate() will be called on it even if it is not a regular file. Fix this by checking the file type in this case too. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/internal.h')
-rw-r--r--fs/internal.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/internal.h b/fs/internal.h
index d2a23ff61b4..70067775df2 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -85,6 +85,11 @@ extern struct super_block *user_get_super(dev_t);
struct nameidata;
extern struct file *nameidata_to_filp(struct nameidata *);
extern void release_open_intent(struct nameidata *);
+struct opendata {
+ struct dentry *dentry;
+ struct vfsmount *mnt;
+ struct file **filp;
+};
struct open_flags {
int open_flag;
umode_t mode;