diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2010-03-22 08:53:19 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2010-05-21 18:31:14 -0400 |
| commit | b20bd1a5e78af267dc4b6e1ffed48d5d776302c5 (patch) | |
| tree | d50982ee42500712d9add489435d4455580b9cac /fs/super.c | |
| parent | 389b8be6ef419397e4f176652927ebad6ebb4b77 (diff) | |
| download | linux-3.10-b20bd1a5e78af267dc4b6e1ffed48d5d776302c5.tar.gz linux-3.10-b20bd1a5e78af267dc4b6e1ffed48d5d776302c5.tar.bz2 linux-3.10-b20bd1a5e78af267dc4b6e1ffed48d5d776302c5.zip | |
get rid of S_BIAS
use atomic_inc_not_zero(&sb->s_active) instead of playing games with
checking ->s_count > S_BIAS
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/super.c')
| -rw-r--r-- | fs/super.c | 28 |
1 files changed, 11 insertions, 17 deletions
diff --git a/fs/super.c b/fs/super.c index d8c8b1d2d01..bc734f8b3e1 100644 --- a/fs/super.c +++ b/fs/super.c @@ -93,7 +93,7 @@ static struct super_block *alloc_super(struct file_system_type *type) * subclass. */ down_write_nested(&s->s_umount, SINGLE_DEPTH_NESTING); - s->s_count = S_BIAS; + s->s_count = 1; atomic_set(&s->s_active, 1); mutex_init(&s->s_vfs_rename_mutex); mutex_init(&s->s_dquot.dqio_mutex); @@ -189,9 +189,7 @@ void put_super(struct super_block *sb) void deactivate_super(struct super_block *s) { struct file_system_type *fs = s->s_type; - if (atomic_dec_and_lock(&s->s_active, &sb_lock)) { - s->s_count -= S_BIAS-1; - spin_unlock(&sb_lock); + if (atomic_dec_and_test(&s->s_active)) { vfs_dq_off(s, 0); down_write(&s->s_umount); fs->kill_sb(s); @@ -216,9 +214,7 @@ EXPORT_SYMBOL(deactivate_super); void deactivate_locked_super(struct super_block *s) { struct file_system_type *fs = s->s_type; - if (atomic_dec_and_lock(&s->s_active, &sb_lock)) { - s->s_count -= S_BIAS-1; - spin_unlock(&sb_lock); + if (atomic_dec_and_test(&s->s_active)) { vfs_dq_off(s, 0); fs->kill_sb(s); put_filesystem(fs); @@ -243,21 +239,19 @@ EXPORT_SYMBOL(deactivate_locked_super); */ static int grab_super(struct super_block *s) __releases(sb_lock) { + if (atomic_inc_not_zero(&s->s_active)) { + spin_unlock(&sb_lock); + down_write(&s->s_umount); + return 1; + } + /* it's going away */ s->s_count++; spin_unlock(&sb_lock); + /* usually that'll be enough for it to die... */ down_write(&s->s_umount); - if (s->s_root) { - spin_lock(&sb_lock); - if (s->s_count > S_BIAS) { - atomic_inc(&s->s_active); - s->s_count--; - spin_unlock(&sb_lock); - return 1; - } - spin_unlock(&sb_lock); - } up_write(&s->s_umount); put_super(s); + /* ... but in case it wasn't, let's at least yield() */ yield(); return 0; } |