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| author | Arjan van de Ven <arjan@linux.intel.com> | 2008-10-17 18:20:26 +0200 |
|---|---|---|
| committer | Arjan van de Ven <arjan@linux.intel.com> | 2008-10-17 18:20:26 +0200 |
| commit | 651dab4264e4ba0e563f5ff56f748127246e9065 (patch) | |
| tree | 016630974bdcb00fe529b673f96d389e0fd6dc94 /Documentation/filesystems/Locking | |
| parent | DECLARE_PER_CPU needs linux/percpu.h (diff) | |
| parent | {pci,pnp} quirks.c: don't use deprecated print_fn_descriptor_symbol() (diff) | |
| download | linux-651dab4264e4ba0e563f5ff56f748127246e9065.tar.xz linux-651dab4264e4ba0e563f5ff56f748127246e9065.zip | |
Merge commit 'linus/master' into merge-linus
Conflicts:
arch/x86/kvm/i8254.c
Diffstat (limited to 'Documentation/filesystems/Locking')
| -rw-r--r-- | Documentation/filesystems/Locking | 15 |
1 files changed, 4 insertions, 11 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index 680fb566b928..8362860e21a7 100644 --- a/Documentation/filesystems/Locking +++ b/Documentation/filesystems/Locking @@ -144,8 +144,8 @@ prototypes: void (*kill_sb) (struct super_block *); locking rules: may block BKL -get_sb yes yes -kill_sb yes yes +get_sb yes no +kill_sb yes no ->get_sb() returns error or 0 with locked superblock attached to the vfsmount (exclusive on ->s_umount). @@ -409,12 +409,12 @@ ioctl: yes (see below) unlocked_ioctl: no (see below) compat_ioctl: no mmap: no -open: maybe (see below) +open: no flush: no release: no fsync: no (see below) aio_fsync: no -fasync: yes (see below) +fasync: no lock: yes readv: no writev: no @@ -431,13 +431,6 @@ For many filesystems, it is probably safe to acquire the inode semaphore. Note some filesystems (i.e. remote ones) provide no protection for i_size so you will need to use the BKL. -->open() locking is in-transit: big lock partially moved into the methods. -The only exception is ->open() in the instances of file_operations that never -end up in ->i_fop/->proc_fops, i.e. ones that belong to character devices -(chrdev_open() takes lock before replacing ->f_op and calling the secondary -method. As soon as we fix the handling of module reference counters all -instances of ->open() will be called without the BKL. - Note: ext2_release() was *the* source of contention on fs-intensive loads and dropping BKL on ->release() helps to get rid of that (we still grab BKL for cases when we close a file that had been opened r/w, but that |