diff options
| -rw-r--r-- | fs/jfs/inode.c | 6 | ||||
| -rw-r--r-- | fs/jfs/jfs_dmap.c | 16 | ||||
| -rw-r--r-- | fs/jfs/jfs_imap.c | 16 | ||||
| -rw-r--r-- | fs/jfs/jfs_incore.h | 29 | ||||
| -rw-r--r-- | fs/jfs/namei.c | 48 |
5 files changed, 74 insertions, 41 deletions
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c index f571911..e285022 100644 --- a/fs/jfs/inode.c +++ b/fs/jfs/inode.c @@ -182,9 +182,9 @@ int jfs_get_block(struct inode *ip, sector_t lblock, * Take appropriate lock on inode */ if (create) - IWRITE_LOCK(ip); + IWRITE_LOCK(ip, RDWRLOCK_NORMAL); else - IREAD_LOCK(ip); + IREAD_LOCK(ip, RDWRLOCK_NORMAL); if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && @@ -359,7 +359,7 @@ void jfs_truncate(struct inode *ip) nobh_truncate_page(ip->i_mapping, ip->i_size); - IWRITE_LOCK(ip); + IWRITE_LOCK(ip, RDWRLOCK_NORMAL); jfs_truncate_nolock(ip, ip->i_size); IWRITE_UNLOCK(ip); } diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index 23546c8..82b0544 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -337,7 +337,7 @@ int dbFree(struct inode *ip, s64 blkno, s64 nblocks) struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap; struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap; - IREAD_LOCK(ipbmap); + IREAD_LOCK(ipbmap, RDWRLOCK_DMAP); /* block to be freed better be within the mapsize. */ if (unlikely((blkno == 0) || (blkno + nblocks > bmp->db_mapsize))) { @@ -733,7 +733,7 @@ int dbAlloc(struct inode *ip, s64 hint, s64 nblocks, s64 * results) * allocation group size, try to allocate anywhere. */ if (l2nb > bmp->db_agl2size) { - IWRITE_LOCK(ipbmap); + IWRITE_LOCK(ipbmap, RDWRLOCK_DMAP); rc = dbAllocAny(bmp, nblocks, l2nb, results); @@ -774,7 +774,7 @@ int dbAlloc(struct inode *ip, s64 hint, s64 nblocks, s64 * results) * the hint using a tiered strategy. */ if (nblocks <= BPERDMAP) { - IREAD_LOCK(ipbmap); + IREAD_LOCK(ipbmap, RDWRLOCK_DMAP); /* get the buffer for the dmap containing the hint. */ @@ -844,7 +844,7 @@ int dbAlloc(struct inode *ip, s64 hint, s64 nblocks, s64 * results) /* try to satisfy the allocation request with blocks within * the same allocation group as the hint. */ - IWRITE_LOCK(ipbmap); + IWRITE_LOCK(ipbmap, RDWRLOCK_DMAP); if ((rc = dbAllocAG(bmp, agno, nblocks, l2nb, results)) != -ENOSPC) goto write_unlock; @@ -856,7 +856,7 @@ int dbAlloc(struct inode *ip, s64 hint, s64 nblocks, s64 * results) * Let dbNextAG recommend a preferred allocation group */ agno = dbNextAG(ipbmap); - IWRITE_LOCK(ipbmap); + IWRITE_LOCK(ipbmap, RDWRLOCK_DMAP); /* Try to allocate within this allocation group. if that fails, try to * allocate anywhere in the map. @@ -900,7 +900,7 @@ int dbAllocExact(struct inode *ip, s64 blkno, int nblocks) s64 lblkno; struct metapage *mp; - IREAD_LOCK(ipbmap); + IREAD_LOCK(ipbmap, RDWRLOCK_DMAP); /* * validate extent request: @@ -1050,7 +1050,7 @@ static int dbExtend(struct inode *ip, s64 blkno, s64 nblocks, s64 addnblocks) */ extblkno = lastblkno + 1; - IREAD_LOCK(ipbmap); + IREAD_LOCK(ipbmap, RDWRLOCK_DMAP); /* better be within the file system */ bmp = sbi->bmap; @@ -3116,7 +3116,7 @@ int dbAllocBottomUp(struct inode *ip, s64 blkno, s64 nblocks) struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap; struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap; - IREAD_LOCK(ipbmap); + IREAD_LOCK(ipbmap, RDWRLOCK_DMAP); /* block to be allocated better be within the mapsize. */ ASSERT(nblocks <= bmp->db_mapsize - blkno); diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c index 53f63b4..aa5124b 100644 --- a/fs/jfs/jfs_imap.c +++ b/fs/jfs/jfs_imap.c @@ -331,7 +331,7 @@ int diRead(struct inode *ip) /* read the iag */ imap = JFS_IP(ipimap)->i_imap; - IREAD_LOCK(ipimap); + IREAD_LOCK(ipimap, RDWRLOCK_IMAP); rc = diIAGRead(imap, iagno, &mp); IREAD_UNLOCK(ipimap); if (rc) { @@ -920,7 +920,7 @@ int diFree(struct inode *ip) /* Obtain read lock in imap inode. Don't release it until we have * read all of the IAG's that we are going to. */ - IREAD_LOCK(ipimap); + IREAD_LOCK(ipimap, RDWRLOCK_IMAP); /* read the iag. */ @@ -1415,7 +1415,7 @@ int diAlloc(struct inode *pip, bool dir, struct inode *ip) AG_LOCK(imap, agno); /* Get read lock on imap inode */ - IREAD_LOCK(ipimap); + IREAD_LOCK(ipimap, RDWRLOCK_IMAP); /* get the iag number and read the iag */ iagno = INOTOIAG(inum); @@ -1808,7 +1808,7 @@ static int diAllocIno(struct inomap * imap, int agno, struct inode *ip) return -ENOSPC; /* obtain read lock on imap inode */ - IREAD_LOCK(imap->im_ipimap); + IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP); /* read the iag at the head of the list. */ @@ -1946,7 +1946,7 @@ static int diAllocExt(struct inomap * imap, int agno, struct inode *ip) } else { /* read the iag. */ - IREAD_LOCK(imap->im_ipimap); + IREAD_LOCK(imap->im_ipimap, RDWRLOCK_IMAP); if ((rc = diIAGRead(imap, iagno, &mp))) { IREAD_UNLOCK(imap->im_ipimap); jfs_error(ip->i_sb, "diAllocExt: error reading iag"); @@ -2509,7 +2509,7 @@ diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp) */ /* acquire inode map lock */ - IWRITE_LOCK(ipimap); + IWRITE_LOCK(ipimap, RDWRLOCK_IMAP); if (ipimap->i_size >> L2PSIZE != imap->im_nextiag + 1) { IWRITE_UNLOCK(ipimap); @@ -2648,7 +2648,7 @@ diNewIAG(struct inomap * imap, int *iagnop, int agno, struct metapage ** mpp) } /* obtain read lock on map */ - IREAD_LOCK(ipimap); + IREAD_LOCK(ipimap, RDWRLOCK_IMAP); /* read the iag */ if ((rc = diIAGRead(imap, iagno, &mp))) { @@ -2779,7 +2779,7 @@ diUpdatePMap(struct inode *ipimap, return -EIO; } /* read the iag */ - IREAD_LOCK(ipimap); + IREAD_LOCK(ipimap, RDWRLOCK_IMAP); rc = diIAGRead(imap, iagno, &mp); IREAD_UNLOCK(ipimap); if (rc) diff --git a/fs/jfs/jfs_incore.h b/fs/jfs/jfs_incore.h index 9400558..8f453ef 100644 --- a/fs/jfs/jfs_incore.h +++ b/fs/jfs/jfs_incore.h @@ -109,9 +109,11 @@ struct jfs_inode_info { #define JFS_ACL_NOT_CACHED ((void *)-1) -#define IREAD_LOCK(ip) down_read(&JFS_IP(ip)->rdwrlock) +#define IREAD_LOCK(ip, subclass) \ + down_read_nested(&JFS_IP(ip)->rdwrlock, subclass) #define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock) -#define IWRITE_LOCK(ip) down_write(&JFS_IP(ip)->rdwrlock) +#define IWRITE_LOCK(ip, subclass) \ + down_write_nested(&JFS_IP(ip)->rdwrlock, subclass) #define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock) /* @@ -127,6 +129,29 @@ enum cflags { COMMIT_Synclist, /* metadata pages on group commit synclist */ }; +/* + * commit_mutex nesting subclasses: + */ +enum commit_mutex_class +{ + COMMIT_MUTEX_PARENT, + COMMIT_MUTEX_CHILD, + COMMIT_MUTEX_SECOND_PARENT, /* Renaming */ + COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */ +}; + +/* + * rdwrlock subclasses: + * The dmap inode may be locked while a normal inode or the imap inode are + * locked. + */ +enum rdwrlock_class +{ + RDWRLOCK_NORMAL, + RDWRLOCK_IMAP, + RDWRLOCK_DMAP +}; + #define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag)) #define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag)) #define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag)) diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c index a6a8c16..7ab4756 100644 --- a/fs/jfs/namei.c +++ b/fs/jfs/namei.c @@ -104,8 +104,8 @@ static int jfs_create(struct inode *dip, struct dentry *dentry, int mode, tid = txBegin(dip->i_sb, 0); - mutex_lock(&JFS_IP(dip)->commit_mutex); - mutex_lock(&JFS_IP(ip)->commit_mutex); + mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); + mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); rc = jfs_init_acl(tid, ip, dip); if (rc) @@ -238,8 +238,8 @@ static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode) tid = txBegin(dip->i_sb, 0); - mutex_lock(&JFS_IP(dip)->commit_mutex); - mutex_lock(&JFS_IP(ip)->commit_mutex); + mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); + mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); rc = jfs_init_acl(tid, ip, dip); if (rc) @@ -365,8 +365,8 @@ static int jfs_rmdir(struct inode *dip, struct dentry *dentry) tid = txBegin(dip->i_sb, 0); - mutex_lock(&JFS_IP(dip)->commit_mutex); - mutex_lock(&JFS_IP(ip)->commit_mutex); + mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); + mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); iplist[0] = dip; iplist[1] = ip; @@ -483,12 +483,12 @@ static int jfs_unlink(struct inode *dip, struct dentry *dentry) if ((rc = get_UCSname(&dname, dentry))) goto out; - IWRITE_LOCK(ip); + IWRITE_LOCK(ip, RDWRLOCK_NORMAL); tid = txBegin(dip->i_sb, 0); - mutex_lock(&JFS_IP(dip)->commit_mutex); - mutex_lock(&JFS_IP(ip)->commit_mutex); + mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); + mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); iplist[0] = dip; iplist[1] = ip; @@ -802,8 +802,8 @@ static int jfs_link(struct dentry *old_dentry, tid = txBegin(ip->i_sb, 0); - mutex_lock(&JFS_IP(dir)->commit_mutex); - mutex_lock(&JFS_IP(ip)->commit_mutex); + mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); + mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); /* * scan parent directory for entry/freespace @@ -913,8 +913,8 @@ static int jfs_symlink(struct inode *dip, struct dentry *dentry, tid = txBegin(dip->i_sb, 0); - mutex_lock(&JFS_IP(dip)->commit_mutex); - mutex_lock(&JFS_IP(ip)->commit_mutex); + mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); + mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); rc = jfs_init_security(tid, ip, dip); if (rc) @@ -1127,7 +1127,7 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry, goto out3; } } else if (new_ip) { - IWRITE_LOCK(new_ip); + IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL); /* Init inode for quota operations. */ DQUOT_INIT(new_ip); } @@ -1137,13 +1137,21 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry, */ tid = txBegin(new_dir->i_sb, 0); - mutex_lock(&JFS_IP(new_dir)->commit_mutex); - mutex_lock(&JFS_IP(old_ip)->commit_mutex); + /* + * How do we know the locking is safe from deadlocks? + * The vfs does the hard part for us. Any time we are taking nested + * commit_mutexes, the vfs already has i_mutex held on the parent. + * Here, the vfs has already taken i_mutex on both old_dir and new_dir. + */ + mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT); + mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD); if (old_dir != new_dir) - mutex_lock(&JFS_IP(old_dir)->commit_mutex); + mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex, + COMMIT_MUTEX_SECOND_PARENT); if (new_ip) { - mutex_lock(&JFS_IP(new_ip)->commit_mutex); + mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex, + COMMIT_MUTEX_VICTIM); /* * Change existing directory entry to new inode number */ @@ -1357,8 +1365,8 @@ static int jfs_mknod(struct inode *dir, struct dentry *dentry, tid = txBegin(dir->i_sb, 0); - mutex_lock(&JFS_IP(dir)->commit_mutex); - mutex_lock(&JFS_IP(ip)->commit_mutex); + mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); + mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); rc = jfs_init_acl(tid, ip, dir); if (rc) |
