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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull vfs fixes from Al Viro:
 "atomic_open-related fixes (Miklos' series, with EEXIST-related parts
  replaced with fix in fs/namei.c:atomic_open() instead of messing with
  the instances) + race fix in autofs + leak on failure exit in 9p"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  9p: don't forget to destroy inode cache if fscache registration fails
  atomic_open: take care of EEXIST in no-open case with O_CREAT|O_EXCL in fs/namei.c
  vfs: don't set FILE_CREATED before calling ->atomic_open()
  nfs: set FILE_CREATED
  gfs2: set FILE_CREATED
  cifs: fix filp leak in cifs_atomic_open()
  vfs: improve i_op->atomic_open() documentation
  autofs4: close the races around autofs4_notify_daemon()
This commit is contained in:
Linus Torvalds 2013-09-18 19:22:22 -05:00
commit 3fe03debfc
9 changed files with 62 additions and 43 deletions
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14
Documentation/filesystems/vfs.txt
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@ -359,11 +359,9 @@ struct inode_operations {
ssize_t (*listxattr) (struct dentry *, char *, size_t);
int (*removexattr) (struct dentry *, const char *);
void (*update_time)(struct inode *, struct timespec *, int);
int (*atomic_open)(struct inode *, struct dentry *,
int (*atomic_open)(struct inode *, struct dentry *, struct file *,
unsigned open_flag, umode_t create_mode, int *opened);
int (*tmpfile) (struct inode *, struct dentry *, umode_t);
} ____cacheline_aligned;
struct file *, unsigned open_flag,
umode_t create_mode, int *opened);
};
Again, all methods are called without any locks being held, unless
@ -470,9 +468,11 @@ otherwise noted.
method 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 1 instead of
usual 0 or -ve . This method is only called if the last
component is negative or needs lookup. Cached positive dentries are
still handled by f_op->open().
usual 0 or -ve . This method is only called if the last component is
negative or needs lookup. Cached positive dentries are still handled by
f_op->open(). If the file was created, the FILE_CREATED flag should be
set in "opened". In case of O_EXCL the method must only succeed if the
file didn't exist and hence FILE_CREATED shall always be set on success.
tmpfile: called in the end of O_TMPFILE open(). Optional, equivalent to
atomically creating, opening and unlinking a file in given directory.