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authorLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 17:58:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 17:58:44 -0700
commit426e1f5cec4821945642230218876b0e89aafab1 (patch)
tree2728ace018d0698886989da586210ef1543a7098 /Documentation
parent9e5fca251f44832cb996961048ea977f80faf6ea (diff)
parent63997e98a3be68d7cec806d22bf9b02b2e1daabb (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (52 commits) split invalidate_inodes() fs: skip I_FREEING inodes in writeback_sb_inodes fs: fold invalidate_list into invalidate_inodes fs: do not drop inode_lock in dispose_list fs: inode split IO and LRU lists fs: switch bdev inode bdi's correctly fs: fix buffer invalidation in invalidate_list fsnotify: use dget_parent smbfs: use dget_parent exportfs: use dget_parent fs: use RCU read side protection in d_validate fs: clean up dentry lru modification fs: split __shrink_dcache_sb fs: improve DCACHE_REFERENCED usage fs: use percpu counter for nr_dentry and nr_dentry_unused fs: simplify __d_free fs: take dcache_lock inside __d_path fs: do not assign default i_ino in new_inode fs: introduce a per-cpu last_ino allocator new helper: ihold() ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/Locking31
-rw-r--r--Documentation/filesystems/sharedsubtree.txt4
2 files changed, 25 insertions, 10 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 2db4283efa8..8a817f656f0 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -349,21 +349,36 @@ call this method upon the IO completion.
--------------------------- block_device_operations -----------------------
prototypes:
- int (*open) (struct inode *, struct file *);
- int (*release) (struct inode *, struct file *);
- int (*ioctl) (struct inode *, struct file *, unsigned, unsigned long);
+ int (*open) (struct block_device *, fmode_t);
+ int (*release) (struct gendisk *, fmode_t);
+ int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
+ int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
+ int (*direct_access) (struct block_device *, sector_t, void **, unsigned long *);
int (*media_changed) (struct gendisk *);
+ void (*unlock_native_capacity) (struct gendisk *);
int (*revalidate_disk) (struct gendisk *);
+ int (*getgeo)(struct block_device *, struct hd_geometry *);
+ void (*swap_slot_free_notify) (struct block_device *, unsigned long);
locking rules:
- BKL bd_sem
-open: yes yes
-release: yes yes
-ioctl: yes no
+ BKL bd_mutex
+open: no yes
+release: no yes
+ioctl: no no
+compat_ioctl: no no
+direct_access: no no
media_changed: no no
+unlock_native_capacity: no no
revalidate_disk: no no
+getgeo: no no
+swap_slot_free_notify: no no (see below)
+
+media_changed, unlock_native_capacity and revalidate_disk are called only from
+check_disk_change().
+
+swap_slot_free_notify is called with swap_lock and sometimes the page lock
+held.
-The last two are called only from check_disk_change().
--------------------------- file_operations -------------------------------
prototypes:
diff --git a/Documentation/filesystems/sharedsubtree.txt b/Documentation/filesystems/sharedsubtree.txt
index fc0e39af43c..4ede421c968 100644
--- a/Documentation/filesystems/sharedsubtree.txt
+++ b/Documentation/filesystems/sharedsubtree.txt
@@ -62,10 +62,10 @@ replicas continue to be exactly same.
# mount /dev/sd0 /tmp/a
#ls /tmp/a
- t1 t2 t2
+ t1 t2 t3
#ls /mnt/a
- t1 t2 t2
+ t1 t2 t3
Note that the mount has propagated to the mount at /mnt as well.