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[XFS] Add lockdep support for XFS 

SGI-PV: 963965
SGI-Modid: xfs-linux-melb:xfs-kern:28485a

Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>
This commit is contained in:
Lachlan McIlroy 2007-05-08 13:50:19 +10:00 committed by Tim Shimmin
parent 71dfd5a396
commit f7c66ce3f7
5 changed files with 88 additions and 28 deletions
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12
fs/xfs/linux-2.6/mrlock.h
View File

@ -43,6 +43,18 @@ static inline void mrupdate(mrlock_t *mrp)
mrp->mr_writer = 1;
}
static inline void mraccess_nested(mrlock_t *mrp, int subclass)
{
down_read_nested(&mrp->mr_lock, subclass);
}
static inline void mrupdate_nested(mrlock_t *mrp, int subclass)
{
down_write_nested(&mrp->mr_lock, subclass);
mrp->mr_writer = 1;
}
static inline int mrtryaccess(mrlock_t *mrp)
{
return down_read_trylock(&mrp->mr_lock);

15
fs/xfs/xfs_iget.c
View File

@ -879,17 +879,17 @@ xfs_ilock(xfs_inode_t *ip,
(XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
(XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
ASSERT((lock_flags & ~XFS_LOCK_MASK) == 0);
ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
if (lock_flags & XFS_IOLOCK_EXCL) {
mrupdate(&ip->i_iolock);
mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
} else if (lock_flags & XFS_IOLOCK_SHARED) {
mraccess(&ip->i_iolock);
mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
}
if (lock_flags & XFS_ILOCK_EXCL) {
mrupdate(&ip->i_lock);
mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
} else if (lock_flags & XFS_ILOCK_SHARED) {
mraccess(&ip->i_lock);
mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
}
xfs_ilock_trace(ip, 1, lock_flags, (inst_t *)__return_address);
}
@ -923,7 +923,7 @@ xfs_ilock_nowait(xfs_inode_t *ip,
(XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
(XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
ASSERT((lock_flags & ~XFS_LOCK_MASK) == 0);
ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
iolocked = 0;
if (lock_flags & XFS_IOLOCK_EXCL) {
@ -983,7 +983,8 @@ xfs_iunlock(xfs_inode_t *ip,
(XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
(XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY)) == 0);
ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY |
XFS_LOCK_DEP_MASK)) == 0);
ASSERT(lock_flags != 0);
if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {

60
fs/xfs/xfs_inode.h
View File

@ -382,26 +382,58 @@ xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
/*
* Flags for inode locking.
* Bit ranges: 1<<1 - 1<<16-1 -- iolock/ilock modes (bitfield)
* 1<<16 - 1<<32-1 -- lockdep annotation (integers)
*/
#define XFS_IOLOCK_EXCL 0x001
#define XFS_IOLOCK_SHARED 0x002
#define XFS_ILOCK_EXCL 0x004
#define XFS_ILOCK_SHARED 0x008
#define XFS_IUNLOCK_NONOTIFY 0x010
/* XFS_IOLOCK_NESTED 0x020 */
#define XFS_EXTENT_TOKEN_RD 0x040
#define XFS_SIZE_TOKEN_RD 0x080
#define XFS_IOLOCK_EXCL (1<<0)
#define XFS_IOLOCK_SHARED (1<<1)
#define XFS_ILOCK_EXCL (1<<2)
#define XFS_ILOCK_SHARED (1<<3)
#define XFS_IUNLOCK_NONOTIFY (1<<4)
/* #define XFS_IOLOCK_NESTED (1<<5) */
#define XFS_EXTENT_TOKEN_RD (1<<6)
#define XFS_SIZE_TOKEN_RD (1<<7)
#define XFS_EXTSIZE_RD (XFS_EXTENT_TOKEN_RD|XFS_SIZE_TOKEN_RD)
#define XFS_WILLLEND 0x100 /* Always acquire tokens for lending */
#define XFS_WILLLEND (1<<8) /* Always acquire tokens for lending */
#define XFS_EXTENT_TOKEN_WR (XFS_EXTENT_TOKEN_RD | XFS_WILLLEND)
#define XFS_SIZE_TOKEN_WR (XFS_SIZE_TOKEN_RD | XFS_WILLLEND)
#define XFS_EXTSIZE_WR (XFS_EXTSIZE_RD | XFS_WILLLEND)
/* XFS_SIZE_TOKEN_WANT 0x200 */
/* TODO:XFS_SIZE_TOKEN_WANT (1<<9) */
#define XFS_LOCK_MASK \
(XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL | \
XFS_ILOCK_SHARED | XFS_EXTENT_TOKEN_RD | XFS_SIZE_TOKEN_RD | \
XFS_WILLLEND)
#define XFS_LOCK_MASK (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
| XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
| XFS_EXTENT_TOKEN_RD | XFS_SIZE_TOKEN_RD \
| XFS_WILLLEND)
/*
* Flags for lockdep annotations.
*
* XFS_I[O]LOCK_PARENT - for operations that require locking two inodes
* (ie directory operations that require locking a directory inode and
* an entry inode). The first inode gets locked with this flag so it
* gets a lockdep subclass of 1 and the second lock will have a lockdep
* subclass of 0.
*
* XFS_I[O]LOCK_INUMORDER - for locking several inodes at the some time
* with xfs_lock_inodes(). This flag is used as the starting subclass
* and each subsequent lock acquired will increment the subclass by one.
* So the first lock acquired will have a lockdep subclass of 2, the
* second lock will have a lockdep subclass of 3, and so on.
*/
#define XFS_IOLOCK_SHIFT 16
#define XFS_IOLOCK_PARENT (1 << XFS_IOLOCK_SHIFT)
#define XFS_IOLOCK_INUMORDER (2 << XFS_IOLOCK_SHIFT)
#define XFS_ILOCK_SHIFT 24
#define XFS_ILOCK_PARENT (1 << XFS_ILOCK_SHIFT)
#define XFS_ILOCK_INUMORDER (2 << XFS_ILOCK_SHIFT)
#define XFS_IOLOCK_DEP_MASK 0x00ff0000
#define XFS_ILOCK_DEP_MASK 0xff000000
#define XFS_LOCK_DEP_MASK (XFS_IOLOCK_DEP_MASK | XFS_ILOCK_DEP_MASK)
#define XFS_IOLOCK_DEP(flags) (((flags) & XFS_IOLOCK_DEP_MASK) >> XFS_IOLOCK_SHIFT)
#define XFS_ILOCK_DEP(flags) (((flags) & XFS_ILOCK_DEP_MASK) >> XFS_ILOCK_SHIFT)
/*
* Flags for xfs_iflush()

2
fs/xfs/xfs_vfsops.c
View File

@ -696,7 +696,7 @@ xfs_unmount_flush(
bhv_vnode_t *rvp = XFS_ITOV(rip);
int error;
xfs_ilock(rip, XFS_ILOCK_EXCL);
xfs_ilock(rip, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
xfs_iflock(rip);
/*

27
fs/xfs/xfs_vnodeops.c
View File

@ -1947,7 +1947,7 @@ xfs_create(
goto error_return;
}
xfs_ilock(dp, XFS_ILOCK_EXCL);
xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
XFS_BMAP_INIT(&free_list, &first_block);
@ -2141,7 +2141,7 @@ xfs_lock_dir_and_entry(
attempts = 0;
again:
xfs_ilock(dp, XFS_ILOCK_EXCL);
xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
e_inum = ip->i_ino;
@ -2209,6 +2209,21 @@ int xfs_lots_retries;
int xfs_lock_delays;
#endif
/*
* Bump the subclass so xfs_lock_inodes() acquires each lock with
* a different value
*/
static inline int
xfs_lock_inumorder(int lock_mode, int subclass)
{
if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL))
lock_mode |= (subclass + XFS_IOLOCK_INUMORDER) << XFS_IOLOCK_SHIFT;
if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL))
lock_mode |= (subclass + XFS_ILOCK_INUMORDER) << XFS_ILOCK_SHIFT;
return lock_mode;
}
/*
* The following routine will lock n inodes in exclusive mode.
* We assume the caller calls us with the inodes in i_ino order.
@ -2276,7 +2291,7 @@ again:
* that is in the AIL.
*/
ASSERT(i != 0);
if (!xfs_ilock_nowait(ips[i], lock_mode)) {
if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) {
attempts++;
/*
@ -2311,7 +2326,7 @@ again:
goto again;
}
} else {
xfs_ilock(ips[i], lock_mode);
xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
}
}
@ -2845,7 +2860,7 @@ xfs_mkdir(
goto error_return;
}
xfs_ilock(dp, XFS_ILOCK_EXCL);
xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
/*
* Check for directory link count overflow.
@ -3399,7 +3414,7 @@ xfs_symlink(
goto error_return;
}
xfs_ilock(dp, XFS_ILOCK_EXCL);
xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
/*
* Check whether the directory allows new symlinks or not.