diff options
Diffstat (limited to 'fs/file.c')
| -rw-r--r-- | fs/file.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/file.c b/fs/file.c index 3fef798b96e5..134274446bf6 100644 --- a/fs/file.c +++ b/fs/file.c @@ -1183,8 +1183,13 @@ struct fd fdget_raw(unsigned int fd) */ static inline bool file_needs_f_pos_lock(struct file *file) { - return (file->f_mode & FMODE_ATOMIC_POS) && - (file_count(file) > 1 || file->f_op->iterate_shared); + if (!(file->f_mode & FMODE_ATOMIC_POS)) + return false; + if (__file_ref_read_raw(&file->f_ref) != FILE_REF_ONEREF) + return true; + if (file->f_op->iterate_shared) + return true; + return false; } struct fd fdget_pos(unsigned int fd) @@ -1192,7 +1197,7 @@ struct fd fdget_pos(unsigned int fd) struct fd f = fdget(fd); struct file *file = fd_file(f); - if (file && file_needs_f_pos_lock(file)) { + if (likely(file) && file_needs_f_pos_lock(file)) { f.word |= FDPUT_POS_UNLOCK; mutex_lock(&file->f_pos_lock); } |