From f7c66ce3f70d8417de0cfb481ca4e5430382ec5d Mon Sep 17 00:00:00 2001 From: Lachlan McIlroy Date: Tue, 8 May 2007 13:50:19 +1000 Subject: [PATCH] [XFS] Add lockdep support for XFS SGI-PV: 963965 SGI-Modid: xfs-linux-melb:xfs-kern:28485a Signed-off-by: Lachlan McIlroy Signed-off-by: David Chinner Signed-off-by: Tim Shimmin --- fs/xfs/linux-2.6/mrlock.h | 12 ++++++++ fs/xfs/xfs_iget.c | 15 +++++----- fs/xfs/xfs_inode.h | 60 ++++++++++++++++++++++++++++++--------- fs/xfs/xfs_vfsops.c | 2 +- fs/xfs/xfs_vnodeops.c | 27 ++++++++++++++---- 5 files changed, 88 insertions(+), 28 deletions(-) diff --git a/fs/xfs/linux-2.6/mrlock.h b/fs/xfs/linux-2.6/mrlock.h index af168a1a98..c110bb0026 100644 --- a/fs/xfs/linux-2.6/mrlock.h +++ b/fs/xfs/linux-2.6/mrlock.h @@ -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); diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c index c1c89dac19..114433a22b 100644 --- a/fs/xfs/xfs_iget.c +++ b/fs/xfs/xfs_iget.c @@ -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)) { diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index cfe7b58c45..f75afecef8 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -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() diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c index 2e830e7f52..65c561201c 100644 --- a/fs/xfs/xfs_vfsops.c +++ b/fs/xfs/xfs_vfsops.c @@ -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); /* diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c index e2c9bbc278..de17aed578 100644 --- a/fs/xfs/xfs_vnodeops.c +++ b/fs/xfs/xfs_vnodeops.c @@ -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. -- 2.39.5