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| author | Christoph Hellwig <hch@lst.de> | 2010-10-06 10:46:53 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2010-10-25 21:18:22 -0400 |
| commit | e1455d1bdccbe056ba53479741b1452106ce59aa (patch) | |
| tree | ed3c4205d7cf72e5ec78e802554178524a368c65 /Documentation | |
| parent | 8358e7d71e712d3bd4e20ecf23e6fd7480c83684 (diff) | |
| download | lwn-e1455d1bdccbe056ba53479741b1452106ce59aa.tar.gz lwn-e1455d1bdccbe056ba53479741b1452106ce59aa.zip | |
update block_device_operations documentation
Updated Documentation/filesystems/Locking to match the code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/filesystems/Locking | 31 |
1 files changed, 23 insertions, 8 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index 2db4283efa8d..8a817f656f0a 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: |