diff options
Diffstat (limited to 'Documentation/filesystems/files.txt')
| -rw-r--r-- | Documentation/filesystems/files.txt | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/Documentation/filesystems/files.txt b/Documentation/filesystems/files.txt index 8c206f4e025..46dfc6b038c 100644 --- a/Documentation/filesystems/files.txt +++ b/Documentation/filesystems/files.txt @@ -55,7 +55,7 @@ the fdtable structure - 2. Reading of the fdtable as described above must be protected by rcu_read_lock()/rcu_read_unlock(). -3. For any update to the the fd table, files->file_lock must +3. For any update to the fd table, files->file_lock must be held. 4. To look up the file structure given an fd, a reader @@ -76,13 +76,13 @@ the fdtable structure - 5. Handling of the file structures is special. Since the look-up of the fd (fget()/fget_light()) are lock-free, it is possible that look-up may race with the last put() operation on the - file structure. This is avoided using the rcuref APIs + file structure. This is avoided using atomic_long_inc_not_zero() on ->f_count : rcu_read_lock(); file = fcheck_files(files, fd); if (file) { - if (rcuref_inc_lf(&file->f_count)) + if (atomic_long_inc_not_zero(&file->f_count)) *fput_needed = 1; else /* Didn't get the reference, someone's freed */ @@ -92,7 +92,7 @@ the fdtable structure - .... return file; - rcuref_inc_lf() detects if refcounts is already zero or + atomic_long_inc_not_zero() detects if refcounts is already zero or goes to zero during increment. If it does, we fail fget()/fget_light(). @@ -113,8 +113,8 @@ the fdtable structure - if (fd >= 0) { /* locate_fd() may have expanded fdtable, load the ptr */ fdt = files_fdtable(files); - FD_SET(fd, fdt->open_fds); - FD_CLR(fd, fdt->close_on_exec); + __set_open_fd(fd, fdt); + __clear_close_on_exec(fd, fdt); spin_unlock(&files->file_lock); ..... |