]> nv-tegra.nvidia Code Review - linux-2.6.git/commitdiff
nilfs2: replace BUG_ON and BUG calls triggerable from ioctl
authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Tue, 7 Apr 2009 02:01:55 +0000 (19:01 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 7 Apr 2009 15:31:19 +0000 (08:31 -0700)
Pekka Enberg advised me:
> It would be nice if BUG(), BUG_ON(), and panic() calls would be
> converted to proper error handling using WARN_ON() calls. The BUG()
> call in nilfs_cpfile_delete_checkpoints(), for example, looks to be
> triggerable from user-space via the ioctl() system call.

This will follow the comment and keep them to a minimum.

Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
13 files changed:
fs/nilfs2/btree.c
fs/nilfs2/cpfile.c
fs/nilfs2/dat.c
fs/nilfs2/direct.c
fs/nilfs2/inode.c
fs/nilfs2/ioctl.c
fs/nilfs2/mdt.c
fs/nilfs2/nilfs.h
fs/nilfs2/page.c
fs/nilfs2/recovery.c
fs/nilfs2/segment.c
fs/nilfs2/sufile.c
fs/nilfs2/super.c

index 53f0d4c31cb0d141ed18609fc9867c1bf2768262..6b37a2767293d1e123454eb662fe90bd76c8f735 100644 (file)
@@ -425,7 +425,6 @@ static int nilfs_btree_node_lookup(const struct nilfs_btree *btree,
                index++;
 
  out:
-       BUG_ON(indexp == NULL);
        *indexp = index;
 
        return s == 0;
@@ -477,8 +476,6 @@ static int nilfs_btree_do_lookup(const struct nilfs_btree *btree,
        __u64 ptr;
        int level, index, found, ret;
 
-       BUG_ON(minlevel <= NILFS_BTREE_LEVEL_DATA);
-
        node = nilfs_btree_get_root(btree);
        level = nilfs_btree_node_get_level(btree, node);
        if ((level < minlevel) ||
@@ -505,7 +502,7 @@ static int nilfs_btree_do_lookup(const struct nilfs_btree *btree,
                if (index < nilfs_btree_node_nchildren_max(btree, node))
                        ptr = nilfs_btree_node_get_ptr(btree, node, index);
                else {
-                       BUG_ON(found || level != NILFS_BTREE_LEVEL_NODE_MIN);
+                       WARN_ON(found || level != NILFS_BTREE_LEVEL_NODE_MIN);
                        /* insert */
                        ptr = NILFS_BMAP_INVALID_PTR;
                }
@@ -1366,7 +1363,7 @@ static int nilfs_btree_prepare_delete(struct nilfs_btree *btree,
                } else {
                        /* no siblings */
                        /* the only child of the root node */
-                       BUG_ON(level != nilfs_btree_height(btree) - 2);
+                       WARN_ON(level != nilfs_btree_height(btree) - 2);
                        if (nilfs_btree_node_get_nchildren(btree, node) - 1 <=
                            NILFS_BTREE_ROOT_NCHILDREN_MAX) {
                                path[level].bp_op = nilfs_btree_shrink;
@@ -1543,7 +1540,7 @@ static int nilfs_btree_gather_data(struct nilfs_bmap *bmap,
                break;
        case 3:
                nchildren = nilfs_btree_node_get_nchildren(btree, root);
-               BUG_ON(nchildren > 1);
+               WARN_ON(nchildren > 1);
                ptr = nilfs_btree_node_get_ptr(btree, root, nchildren - 1);
                ret = nilfs_bmap_get_block(bmap, ptr, &bh);
                if (ret < 0)
@@ -1552,7 +1549,7 @@ static int nilfs_btree_gather_data(struct nilfs_bmap *bmap,
                break;
        default:
                node = NULL;
-               BUG();
+               return -EINVAL;
        }
 
        nchildren = nilfs_btree_node_get_nchildren(btree, node);
@@ -1833,14 +1830,13 @@ static int nilfs_btree_prepare_propagate_v(struct nilfs_btree *btree,
        while ((++level < nilfs_btree_height(btree) - 1) &&
               !buffer_dirty(path[level].bp_bh)) {
 
-               BUG_ON(buffer_nilfs_volatile(path[level].bp_bh));
+               WARN_ON(buffer_nilfs_volatile(path[level].bp_bh));
                ret = nilfs_btree_prepare_update_v(btree, path, level);
                if (ret < 0)
                        goto out;
        }
 
        /* success */
-       BUG_ON(maxlevelp == NULL);
        *maxlevelp = level - 1;
        return 0;
 
@@ -1909,7 +1905,7 @@ static int nilfs_btree_propagate(const struct nilfs_bmap *bmap,
        __u64 key;
        int level, ret;
 
-       BUG_ON(!buffer_dirty(bh));
+       WARN_ON(!buffer_dirty(bh));
 
        btree = (struct nilfs_btree *)bmap;
        path = nilfs_btree_alloc_path(btree);
@@ -1928,12 +1924,9 @@ static int nilfs_btree_propagate(const struct nilfs_bmap *bmap,
 
        ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1);
        if (ret < 0) {
-               /* BUG_ON(ret == -ENOENT); */
-               if (ret == -ENOENT) {
+               if (unlikely(ret == -ENOENT))
                        printk(KERN_CRIT "%s: key = %llu, level == %d\n",
                               __func__, (unsigned long long)key, level);
-                       BUG();
-               }
                goto out;
        }
 
@@ -2117,7 +2110,7 @@ static int nilfs_btree_assign(struct nilfs_bmap *bmap,
 
        ret = nilfs_btree_do_lookup(btree, path, key, NULL, level + 1);
        if (ret < 0) {
-               BUG_ON(ret == -ENOENT);
+               WARN_ON(ret == -ENOENT);
                goto out;
        }
 
@@ -2175,12 +2168,12 @@ static int nilfs_btree_mark(struct nilfs_bmap *bmap, __u64 key, int level)
 
        ret = nilfs_btree_do_lookup(btree, path, key, &ptr, level + 1);
        if (ret < 0) {
-               BUG_ON(ret == -ENOENT);
+               WARN_ON(ret == -ENOENT);
                goto out;
        }
        ret = nilfs_bmap_get_block(&btree->bt_bmap, ptr, &bh);
        if (ret < 0) {
-               BUG_ON(ret == -ENOENT);
+               WARN_ON(ret == -ENOENT);
                goto out;
        }
 
index 218b344185082fb29ed8741822c2efb37c9616fc..e90b60dfced9c40f728546400940f6ff12afb5a9 100644 (file)
@@ -40,10 +40,7 @@ nilfs_cpfile_checkpoints_per_block(const struct inode *cpfile)
 static unsigned long
 nilfs_cpfile_get_blkoff(const struct inode *cpfile, __u64 cno)
 {
-       __u64 tcno;
-
-       BUG_ON(cno == 0); /* checkpoint number 0 is invalid */
-       tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1;
+       __u64 tcno = cno + NILFS_MDT(cpfile)->mi_first_entry_offset - 1;
        do_div(tcno, nilfs_cpfile_checkpoints_per_block(cpfile));
        return (unsigned long)tcno;
 }
@@ -96,7 +93,7 @@ nilfs_cpfile_block_sub_valid_checkpoints(const struct inode *cpfile,
        struct nilfs_checkpoint *cp = kaddr + bh_offset(bh);
        unsigned int count;
 
-       BUG_ON(le32_to_cpu(cp->cp_checkpoints_count) < n);
+       WARN_ON(le32_to_cpu(cp->cp_checkpoints_count) < n);
        count = le32_to_cpu(cp->cp_checkpoints_count) - n;
        cp->cp_checkpoints_count = cpu_to_le32(count);
        return count;
@@ -178,6 +175,8 @@ static inline int nilfs_cpfile_delete_checkpoint_block(struct inode *cpfile,
  * %-ENOMEM - Insufficient amount of memory available.
  *
  * %-ENOENT - No such checkpoint.
+ *
+ * %-EINVAL - invalid checkpoint.
  */
 int nilfs_cpfile_get_checkpoint(struct inode *cpfile,
                                __u64 cno,
@@ -191,8 +190,9 @@ int nilfs_cpfile_get_checkpoint(struct inode *cpfile,
        void *kaddr;
        int ret;
 
-       BUG_ON(cno < 1 || cno > nilfs_mdt_cno(cpfile) ||
-              (cno < nilfs_mdt_cno(cpfile) && create));
+       if (unlikely(cno < 1 || cno > nilfs_mdt_cno(cpfile) ||
+                    (cno < nilfs_mdt_cno(cpfile) && create)))
+               return -EINVAL;
 
        down_write(&NILFS_MDT(cpfile)->mi_sem);
 
@@ -288,12 +288,11 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
        unsigned long tnicps;
        int ret, ncps, nicps, count, i;
 
-       if ((start == 0) || (start > end)) {
-               printk(KERN_CRIT "%s: start = %llu, end = %llu\n",
-                      __func__,
-                      (unsigned long long)start,
-                      (unsigned long long)end);
-               BUG();
+       if (unlikely(start == 0 || start > end)) {
+               printk(KERN_ERR "%s: invalid range of checkpoint numbers: "
+                      "[%llu, %llu)\n", __func__,
+                      (unsigned long long)start, (unsigned long long)end);
+               return -EINVAL;
        }
 
        /* cannot delete the latest checkpoint */
@@ -323,7 +322,7 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
                        cpfile, cno, cp_bh, kaddr);
                nicps = 0;
                for (i = 0; i < ncps; i++, cp = (void *)cp + cpsz) {
-                       BUG_ON(nilfs_checkpoint_snapshot(cp));
+                       WARN_ON(nilfs_checkpoint_snapshot(cp));
                        if (!nilfs_checkpoint_invalid(cp)) {
                                nilfs_checkpoint_set_invalid(cp);
                                nicps++;
@@ -393,6 +392,8 @@ static ssize_t nilfs_cpfile_do_get_cpinfo(struct inode *cpfile, __u64 *cnop,
        int n, ret;
        int ncps, i;
 
+       if (cno == 0)
+               return -ENOENT; /* checkpoint number 0 is invalid */
        down_read(&NILFS_MDT(cpfile)->mi_sem);
 
        for (n = 0; cno < cur_cno && n < nci; cno += ncps) {
@@ -532,9 +533,6 @@ int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno)
        ssize_t nci;
        int ret;
 
-       /* checkpoint number 0 is invalid */
-       if (cno == 0)
-               return -ENOENT;
        nci = nilfs_cpfile_do_get_cpinfo(cpfile, &tcno, &ci, 1);
        if (nci < 0)
                return nci;
@@ -582,6 +580,8 @@ static int nilfs_cpfile_set_snapshot(struct inode *cpfile, __u64 cno)
        void *kaddr;
        int ret;
 
+       if (cno == 0)
+               return -ENOENT; /* checkpoint number 0 is invalid */
        down_write(&NILFS_MDT(cpfile)->mi_sem);
 
        ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
@@ -698,6 +698,8 @@ static int nilfs_cpfile_clear_snapshot(struct inode *cpfile, __u64 cno)
        void *kaddr;
        int ret;
 
+       if (cno == 0)
+               return -ENOENT; /* checkpoint number 0 is invalid */
        down_write(&NILFS_MDT(cpfile)->mi_sem);
 
        ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &cp_bh);
@@ -813,6 +815,8 @@ int nilfs_cpfile_is_snapshot(struct inode *cpfile, __u64 cno)
        void *kaddr;
        int ret;
 
+       if (cno == 0)
+               return -ENOENT; /* checkpoint number 0 is invalid */
        down_read(&NILFS_MDT(cpfile)->mi_sem);
 
        ret = nilfs_cpfile_get_checkpoint_block(cpfile, cno, 0, &bh);
index 9360920f7d3845f3950054aa98b1f86bf2e0d504..bb8a5818e7f119d46ffbbb6b3309f523a6dc060d 100644 (file)
@@ -135,7 +135,7 @@ int nilfs_dat_prepare_start(struct inode *dat, struct nilfs_palloc_req *req)
        int ret;
 
        ret = nilfs_dat_prepare_entry(dat, req, 0);
-       BUG_ON(ret == -ENOENT);
+       WARN_ON(ret == -ENOENT);
        return ret;
 }
 
@@ -157,7 +157,6 @@ void nilfs_dat_commit_start(struct inode *dat, struct nilfs_palloc_req *req,
                       (unsigned long long)le64_to_cpu(entry->de_start),
                       (unsigned long long)le64_to_cpu(entry->de_end),
                       (unsigned long long)le64_to_cpu(entry->de_blocknr));
-               BUG();
        }
        entry->de_blocknr = cpu_to_le64(blocknr);
        kunmap_atomic(kaddr, KM_USER0);
@@ -180,7 +179,7 @@ int nilfs_dat_prepare_end(struct inode *dat, struct nilfs_palloc_req *req)
 
        ret = nilfs_dat_prepare_entry(dat, req, 0);
        if (ret < 0) {
-               BUG_ON(ret == -ENOENT);
+               WARN_ON(ret == -ENOENT);
                return ret;
        }
 
@@ -216,7 +215,7 @@ void nilfs_dat_commit_end(struct inode *dat, struct nilfs_palloc_req *req,
        end = start = le64_to_cpu(entry->de_start);
        if (!dead) {
                end = nilfs_mdt_cno(dat);
-               BUG_ON(start > end);
+               WARN_ON(start > end);
        }
        entry->de_end = cpu_to_le64(end);
        blocknr = le64_to_cpu(entry->de_blocknr);
@@ -324,14 +323,16 @@ int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr)
                return ret;
        kaddr = kmap_atomic(entry_bh->b_page, KM_USER0);
        entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
-       if (entry->de_blocknr == cpu_to_le64(0)) {
+       if (unlikely(entry->de_blocknr == cpu_to_le64(0))) {
                printk(KERN_CRIT "%s: vbn = %llu, [%llu, %llu)\n", __func__,
                       (unsigned long long)vblocknr,
                       (unsigned long long)le64_to_cpu(entry->de_start),
                       (unsigned long long)le64_to_cpu(entry->de_end));
-               BUG();
+               kunmap_atomic(kaddr, KM_USER0);
+               brelse(entry_bh);
+               return -EINVAL;
        }
-       BUG_ON(blocknr == 0);
+       WARN_ON(blocknr == 0);
        entry->de_blocknr = cpu_to_le64(blocknr);
        kunmap_atomic(kaddr, KM_USER0);
 
index e3ec24850089d8cb16c6a82184bda1cfabd68b11..c6379e482781542aee0f479df8371b7da95744b0 100644 (file)
@@ -210,7 +210,6 @@ static int nilfs_direct_last_key(const struct nilfs_bmap *bmap, __u64 *keyp)
        if (lastkey == NILFS_DIRECT_KEY_MAX + 1)
                return -ENOENT;
 
-       BUG_ON(keyp == NULL);
        *keyp = lastkey;
 
        return 0;
@@ -366,9 +365,17 @@ static int nilfs_direct_assign(struct nilfs_bmap *bmap,
 
        direct = (struct nilfs_direct *)bmap;
        key = nilfs_bmap_data_get_key(bmap, *bh);
-       BUG_ON(key > NILFS_DIRECT_KEY_MAX);
+       if (unlikely(key > NILFS_DIRECT_KEY_MAX)) {
+               printk(KERN_CRIT "%s: invalid key: %llu\n", __func__,
+                      (unsigned long long)key);
+               return -EINVAL;
+       }
        ptr = nilfs_direct_get_ptr(direct, key);
-       BUG_ON(ptr == NILFS_BMAP_INVALID_PTR);
+       if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) {
+               printk(KERN_CRIT "%s: invalid pointer: %llu\n", __func__,
+                      (unsigned long long)ptr);
+               return -EINVAL;
+       }
 
        return direct->d_ops->dop_assign(direct, key, ptr, bh,
                                         blocknr, binfo);
index 4bf1e2c5bac63fc7d9e8e0dd0c8bcea7df8fbabb..b6536bb2a3247d7cce3b60cbe8217bcdb4d90b98 100644 (file)
@@ -61,12 +61,6 @@ int nilfs_get_block(struct inode *inode, sector_t blkoff,
                map_bh(bh_result, inode->i_sb, blknum);
                goto out;
        }
-       if (unlikely(ret == 1)) {
-               printk(KERN_ERR "nilfs_get_block: bmap_lookup returns "
-                      "buffer_head pointer (blkoff=%llu, blknum=%lu)\n",
-                      (unsigned long long)blkoff, blknum);
-               BUG();
-       }
        /* data block was not found */
        if (ret == -ENOENT && create) {
                struct nilfs_transaction_info ti;
@@ -85,14 +79,14 @@ int nilfs_get_block(struct inode *inode, sector_t blkoff,
                                 * However, the page having this block must
                                 * be locked in this case.
                                 */
-                               printk(KERN_ERR
+                               printk(KERN_WARNING
                                       "nilfs_get_block: a race condition "
                                       "while inserting a data block. "
                                       "(inode number=%lu, file block "
                                       "offset=%llu)\n",
                                       inode->i_ino,
                                       (unsigned long long)blkoff);
-                               BUG();
+                               err = 0;
                        } else if (err == -EINVAL) {
                                nilfs_error(inode->i_sb, __func__,
                                            "broken bmap (inode=%lu)\n",
@@ -621,7 +615,6 @@ void nilfs_truncate(struct inode *inode)
        struct nilfs_transaction_info ti;
        struct super_block *sb = inode->i_sb;
        struct nilfs_inode_info *ii = NILFS_I(inode);
-       int ret;
 
        if (!test_bit(NILFS_I_BMAP, &ii->i_state))
                return;
@@ -630,8 +623,7 @@ void nilfs_truncate(struct inode *inode)
 
        blocksize = sb->s_blocksize;
        blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits;
-       ret = nilfs_transaction_begin(sb, &ti, 0);
-       BUG_ON(ret);
+       nilfs_transaction_begin(sb, &ti, 0); /* never fails */
 
        block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block);
 
@@ -652,7 +644,6 @@ void nilfs_delete_inode(struct inode *inode)
        struct nilfs_transaction_info ti;
        struct super_block *sb = inode->i_sb;
        struct nilfs_inode_info *ii = NILFS_I(inode);
-       int err;
 
        if (unlikely(is_bad_inode(inode))) {
                if (inode->i_data.nrpages)
@@ -660,8 +651,8 @@ void nilfs_delete_inode(struct inode *inode)
                clear_inode(inode);
                return;
        }
-       err = nilfs_transaction_begin(sb, &ti, 0);
-       BUG_ON(err);
+       nilfs_transaction_begin(sb, &ti, 0); /* never fails */
+
        if (inode->i_data.nrpages)
                truncate_inode_pages(&inode->i_data, 0);
 
index cfb27892ffe86c16ad4904d80c1e1476ffd1abcb..108d281ebca5b98bd1cdc53adb41066d2feead7f 100644 (file)
@@ -489,14 +489,14 @@ nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs *nilfs, __u64 *posp,
                        ret = nilfs_mdt_mark_block_dirty(dat,
                                                         bdescs[i].bd_offset);
                        if (ret < 0) {
-                               BUG_ON(ret == -ENOENT);
+                               WARN_ON(ret == -ENOENT);
                                return ret;
                        }
                } else {
                        ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
                                              bdescs[i].bd_level);
                        if (ret < 0) {
-                               BUG_ON(ret == -ENOENT);
+                               WARN_ON(ret == -ENOENT);
                                return ret;
                        }
                }
@@ -519,7 +519,8 @@ nilfs_ioctl_do_free_segments(struct the_nilfs *nilfs, __u64 *posp, int flags,
        struct nilfs_sb_info *sbi = nilfs_get_writer(nilfs);
        int ret;
 
-       BUG_ON(!sbi);
+       if (unlikely(!sbi))
+               return -EROFS;
        ret = nilfs_segctor_add_segments_to_be_freed(
                NILFS_SC(sbi), buf, nmembs);
        nilfs_put_writer(nilfs);
@@ -539,6 +540,7 @@ int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
                                       void __user *argp)
 {
        struct nilfs_argv argv[5];
+       const char *msg;
        int dir, ret;
 
        if (copy_from_user(argv, argp, sizeof(argv)))
@@ -546,31 +548,50 @@ int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
 
        dir = _IOC_WRITE;
        ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], dir);
-       if (ret < 0)
-               goto out_move_blks;
+       if (ret < 0) {
+               msg = "cannot read source blocks";
+               goto failed;
+       }
        ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], dir);
-       if (ret < 0)
-               goto out_del_cps;
+       if (ret < 0) {
+               /*
+                * can safely abort because checkpoints can be removed
+                * independently.
+                */
+               msg = "cannot delete checkpoints";
+               goto failed;
+       }
        ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], dir);
-       if (ret < 0)
-               goto out_free_vbns;
+       if (ret < 0) {
+               /*
+                * can safely abort because DAT file is updated atomically
+                * using a copy-on-write technique.
+                */
+               msg = "cannot delete virtual blocks from DAT file";
+               goto failed;
+       }
        ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], dir);
-       if (ret < 0)
-               goto out_free_vbns;
+       if (ret < 0) {
+               /*
+                * can safely abort because the operation is nondestructive.
+                */
+               msg = "cannot mark copying blocks dirty";
+               goto failed;
+       }
        ret = nilfs_ioctl_free_segments(nilfs, &argv[4], dir);
-       if (ret < 0)
-               goto out_free_segs;
-
+       if (ret < 0) {
+               /*
+                * can safely abort because this operation is atomic.
+                */
+               msg = "cannot set segments to be freed";
+               goto failed;
+       }
        return 0;
 
- out_free_segs:
-       BUG(); /* XXX: not implemented yet */
- out_free_vbns:
-       BUG();/* XXX: not implemented yet */
- out_del_cps:
-       BUG();/* XXX: not implemented yet */
- out_move_blks:
+ failed:
        nilfs_remove_all_gcinode(nilfs);
+       printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
+              msg, ret);
        return ret;
 }
 
index e0a632b86febda04da448b1ec2bd8ee23b536443..47dd815433fd4df6b5e484b3b52cbc6a0cc5294f 100644 (file)
@@ -154,10 +154,8 @@ nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff,
                        ret = -EBUSY;
                        goto failed_bh;
                }
-       } else {
-               BUG_ON(mode != READ);
+       } else /* mode == READ */
                lock_buffer(bh);
-       }
 
        if (buffer_uptodate(bh)) {
                unlock_buffer(bh);
index d08fb1ce50125bd5862951049862ad3e446f560e..a7f5bc724e337ad42fa269fe8d7b772f732edf24 100644 (file)
@@ -173,7 +173,6 @@ static inline void nilfs_set_transaction_flag(unsigned int flag)
 {
        struct nilfs_transaction_info *ti = current->journal_info;
 
-       BUG_ON(!ti);
        ti->ti_flags |= flag;
 }
 
index 7b18be8cd47a33b78316b2d64dee70c7d32fc5a8..1bfbba9c0e9ae3aba969e6c3341968ce24916a7d 100644 (file)
@@ -417,7 +417,7 @@ repeat:
                dpage = find_lock_page(dmap, offset);
                if (dpage) {
                        /* override existing page on the destination cache */
-                       BUG_ON(PageDirty(dpage));
+                       WARN_ON(PageDirty(dpage));
                        nilfs_copy_page(dpage, page, 0);
                        unlock_page(dpage);
                        page_cache_release(dpage);
@@ -427,17 +427,15 @@ repeat:
                        /* move the page to the destination cache */
                        spin_lock_irq(&smap->tree_lock);
                        page2 = radix_tree_delete(&smap->page_tree, offset);
-                       if (unlikely(page2 != page))
-                               NILFS_PAGE_BUG(page, "page removal failed "
-                                              "(offset=%lu, page2=%p)",
-                                              offset, page2);
+                       WARN_ON(page2 != page);
+
                        smap->nrpages--;
                        spin_unlock_irq(&smap->tree_lock);
 
                        spin_lock_irq(&dmap->tree_lock);
                        err = radix_tree_insert(&dmap->page_tree, offset, page);
                        if (unlikely(err < 0)) {
-                               BUG_ON(err == -EEXIST);
+                               WARN_ON(err == -EEXIST);
                                page->mapping = NULL;
                                page_cache_release(page); /* for cache */
                        } else {
index a4253f34e1386d23680154e4ff9cfbcfd0185065..ef387b19682ca7d7bf044a5514f6db34f9b9da84 100644 (file)
@@ -92,9 +92,6 @@ static int nilfs_warn_segment_error(int err)
                printk(KERN_WARNING
                       "NILFS warning: No super root in the last segment\n");
                break;
-       case NILFS_SEG_VALID:
-       default:
-               BUG();
        }
        return -EINVAL;
 }
index 24d0fbd4271ce647888c86ba95ad9f6883345c93..9a87410985b9f5afffeaf8c10409ec5824e20240 100644 (file)
@@ -334,8 +334,7 @@ static void nilfs_transaction_lock(struct nilfs_sb_info *sbi,
 {
        struct nilfs_transaction_info *cur_ti = current->journal_info;
 
-       BUG_ON(cur_ti);
-       BUG_ON(!ti);
+       WARN_ON(cur_ti);
        ti->ti_flags = NILFS_TI_WRITER;
        ti->ti_count = 0;
        ti->ti_save = cur_ti;
@@ -546,8 +545,6 @@ static int nilfs_collect_file_data(struct nilfs_sc_info *sci,
 {
        int err;
 
-       /* BUG_ON(!buffer_dirty(bh)); */
-       /* excluded by scan_dirty_data_buffers() */
        err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
        if (unlikely(err < 0))
                return nilfs_handle_bmap_error(err, __func__, inode,
@@ -566,8 +563,6 @@ static int nilfs_collect_file_node(struct nilfs_sc_info *sci,
 {
        int err;
 
-       /* BUG_ON(!buffer_dirty(bh)); */
-       /* excluded by scan_dirty_node_buffers() */
        err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh);
        if (unlikely(err < 0))
                return nilfs_handle_bmap_error(err, __func__, inode,
@@ -579,7 +574,7 @@ static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci,
                                   struct buffer_head *bh,
                                   struct inode *inode)
 {
-       BUG_ON(!buffer_dirty(bh));
+       WARN_ON(!buffer_dirty(bh));
        return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64));
 }
 
@@ -628,7 +623,7 @@ static int nilfs_collect_dat_data(struct nilfs_sc_info *sci,
 static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci,
                                  struct buffer_head *bh, struct inode *inode)
 {
-       BUG_ON(!buffer_dirty(bh));
+       WARN_ON(!buffer_dirty(bh));
        return nilfs_segctor_add_file_block(sci, bh, inode,
                                            sizeof(struct nilfs_binfo_dat));
 }
@@ -862,9 +857,9 @@ static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci)
                nilfs_mdt_mark_dirty(nilfs->ns_cpfile);
                nilfs_cpfile_put_checkpoint(
                        nilfs->ns_cpfile, nilfs->ns_cno, bh_cp);
-       } else {
-               BUG_ON(err == -EINVAL || err == -ENOENT);
-       }
+       } else
+               WARN_ON(err == -EINVAL || err == -ENOENT);
+
        return err;
 }
 
@@ -879,7 +874,7 @@ static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci)
        err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0,
                                          &raw_cp, &bh_cp);
        if (unlikely(err)) {
-               BUG_ON(err == -EINVAL || err == -ENOENT);
+               WARN_ON(err == -EINVAL || err == -ENOENT);
                goto failed_ibh;
        }
        raw_cp->cp_snapshot_list.ssl_next = 0;
@@ -944,7 +939,6 @@ static void nilfs_fill_in_super_root_crc(struct buffer_head *bh_sr, u32 seed)
                (struct nilfs_super_root *)bh_sr->b_data;
        u32 crc;
 
-       BUG_ON(NILFS_SR_BYTES > bh_sr->b_size);
        crc = crc32_le(seed,
                       (unsigned char *)raw_sr + sizeof(raw_sr->sr_sum),
                       NILFS_SR_BYTES - sizeof(raw_sr->sr_sum));
@@ -1022,8 +1016,7 @@ static void nilfs_segctor_cancel_free_segments(struct nilfs_sc_info *sci,
                if (!(ent->flags & NILFS_SLH_FREED))
                        break;
                err = nilfs_sufile_cancel_free(sufile, ent->segnum);
-               BUG_ON(err);
-
+               WARN_ON(err); /* do not happen */
                ent->flags &= ~NILFS_SLH_FREED;
        }
 }
@@ -1472,7 +1465,7 @@ static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
  failed:
        list_for_each_entry_safe(segbuf, n, &list, sb_list) {
                ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
-               BUG_ON(ret);
+               WARN_ON(ret); /* never fails */
                list_del_init(&segbuf->sb_list);
                nilfs_segbuf_free(segbuf);
        }
@@ -1488,7 +1481,7 @@ static void nilfs_segctor_free_incomplete_segments(struct nilfs_sc_info *sci,
        segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
        if (nilfs->ns_nextnum != segbuf->sb_nextnum) {
                ret = nilfs_sufile_free(nilfs->ns_sufile, segbuf->sb_nextnum);
-               BUG_ON(ret);
+               WARN_ON(ret); /* never fails */
        }
        if (segbuf->sb_io_error) {
                /* Case 1: The first segment failed */
@@ -1504,7 +1497,7 @@ static void nilfs_segctor_free_incomplete_segments(struct nilfs_sc_info *sci,
 
        list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
                ret = nilfs_sufile_free(nilfs->ns_sufile, segbuf->sb_nextnum);
-               BUG_ON(ret);
+               WARN_ON(ret); /* never fails */
                if (!done && segbuf->sb_io_error) {
                        if (segbuf->sb_segnum != nilfs->ns_nextnum)
                                /* Case 2: extended segment (!= next) failed */
@@ -1558,7 +1551,7 @@ static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci,
        list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
                ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
                                                     &raw_su, &bh_su);
-               BUG_ON(ret); /* always succeed because bh_su is dirty */
+               WARN_ON(ret); /* always succeed because bh_su is dirty */
                live_blocks = segbuf->sb_sum.nblocks +
                        (segbuf->sb_pseg_start - segbuf->sb_fseg_start);
                raw_su->su_lastmod = cpu_to_le64(sci->sc_seg_ctime);
@@ -1579,7 +1572,7 @@ static void nilfs_segctor_cancel_segusage(struct nilfs_sc_info *sci,
        segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
        ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
                                             &raw_su, &bh_su);
-       BUG_ON(ret); /* always succeed because bh_su is dirty */
+       WARN_ON(ret); /* always succeed because bh_su is dirty */
        raw_su->su_nblocks = cpu_to_le32(segbuf->sb_pseg_start -
                                         segbuf->sb_fseg_start);
        nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum, bh_su);
@@ -1587,7 +1580,7 @@ static void nilfs_segctor_cancel_segusage(struct nilfs_sc_info *sci,
        list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
                ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
                                                     &raw_su, &bh_su);
-               BUG_ON(ret); /* always succeed */
+               WARN_ON(ret); /* always succeed */
                raw_su->su_nblocks = 0;
                nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum,
                                               bh_su);
@@ -1606,7 +1599,7 @@ static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci,
                list_del_init(&segbuf->sb_list);
                sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks;
                ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum);
-               BUG_ON(ret);
+               WARN_ON(ret);
                nilfs_segbuf_free(segbuf);
        }
 }
@@ -1923,7 +1916,6 @@ static int nilfs_page_has_uncleared_buffer(struct page *page)
 
 static void __nilfs_end_page_io(struct page *page, int err)
 {
-       /* BUG_ON(err > 0); */
        if (!err) {
                if (!nilfs_page_buffers_clean(page))
                        __set_page_dirty_nobuffers(page);
@@ -2262,7 +2254,7 @@ static int nilfs_segctor_deactivate_segments(struct nilfs_sc_info *sci,
                if (unlikely(err))
                        goto failed;
                nilfs_segment_usage_clear_active(ent->raw_su);
-               BUG_ON(!buffer_dirty(ent->bh_su));
+               WARN_ON(!buffer_dirty(ent->bh_su));
        }
        return 0;
 
@@ -2340,7 +2332,6 @@ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
                /* Avoid empty segment */
                if (sci->sc_stage.scnt == NILFS_ST_DONE &&
                    NILFS_SEG_EMPTY(&sci->sc_curseg->sb_sum)) {
-                       BUG_ON(mode == SC_LSEG_SR);
                        nilfs_segctor_end_construction(sci, nilfs, 1);
                        goto out;
                }
@@ -2479,9 +2470,8 @@ int nilfs_segctor_add_segments_to_be_freed(struct nilfs_sc_info *sci,
        struct inode *sufile = nilfs->ns_sufile;
        LIST_HEAD(list);
        __u64 *pnum;
-       const char *flag_name;
        size_t i;
-       int err, err2 = 0;
+       int err;
 
        for (pnum = segnum, i = 0; i < nsegs; pnum++, i++) {
                ent = nilfs_alloc_segment_entry(*pnum);
@@ -2495,32 +2485,12 @@ int nilfs_segctor_add_segments_to_be_freed(struct nilfs_sc_info *sci,
                if (unlikely(err))
                        goto failed;
 
-               if (unlikely(le32_to_cpu(ent->raw_su->su_flags) !=
-                            (1UL << NILFS_SEGMENT_USAGE_DIRTY))) {
-                       if (nilfs_segment_usage_clean(ent->raw_su))
-                               flag_name = "clean";
-                       else if (nilfs_segment_usage_active(ent->raw_su))
-                               flag_name = "active";
-                       else if (nilfs_segment_usage_volatile_active(
-                                        ent->raw_su))
-                               flag_name = "volatile active";
-                       else if (!nilfs_segment_usage_dirty(ent->raw_su))
-                               flag_name = "non-dirty";
-                       else
-                               flag_name = "erroneous";
-
-                       printk(KERN_ERR
-                              "NILFS: %s segment is requested to be cleaned "
-                              "(segnum=%llu)\n",
-                              flag_name, (unsigned long long)ent->segnum);
-                       err2 = -EINVAL;
-               }
+               if (unlikely(!nilfs_segment_usage_dirty(ent->raw_su)))
+                       printk(KERN_WARNING "NILFS: unused segment is "
+                              "requested to be cleaned (segnum=%llu)\n",
+                              (unsigned long long)ent->segnum);
                nilfs_close_segment_entry(ent, sufile);
        }
-       if (unlikely(err2)) {
-               err = err2;
-               goto failed;
-       }
        list_splice(&list, sci->sc_cleaning_segments.prev);
        return 0;
 
@@ -2705,8 +2675,6 @@ struct nilfs_segctor_req {
 static void nilfs_segctor_accept(struct nilfs_sc_info *sci,
                                 struct nilfs_segctor_req *req)
 {
-       BUG_ON(!sci);
-
        req->sc_err = req->sb_err = 0;
        spin_lock(&sci->sc_state_lock);
        req->seq_accepted = sci->sc_seq_request;
@@ -3107,7 +3075,7 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
        if (flag || nilfs_segctor_confirm(sci))
                nilfs_segctor_write_out(sci);
 
-       BUG_ON(!list_empty(&sci->sc_copied_buffers));
+       WARN_ON(!list_empty(&sci->sc_copied_buffers));
 
        if (!list_empty(&sci->sc_dirty_files)) {
                nilfs_warning(sbi->s_super, __func__,
@@ -3120,7 +3088,7 @@ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci)
        if (!list_empty(&sci->sc_cleaning_segments))
                nilfs_dispose_segment_list(&sci->sc_cleaning_segments);
 
-       BUG_ON(!list_empty(&sci->sc_segbufs));
+       WARN_ON(!list_empty(&sci->sc_segbufs));
 
        if (sci->sc_sketch_inode) {
                iput(sci->sc_sketch_inode);
index cc714c72b138271d622d69fe8fd80fac01f143f0..4cf47e03a3abb25715be34e7583a797b37982f4b 100644 (file)
@@ -231,10 +231,11 @@ int nilfs_sufile_cancel_free(struct inode *sufile, __u64 segnum)
        kaddr = kmap_atomic(su_bh->b_page, KM_USER0);
        su = nilfs_sufile_block_get_segment_usage(
                sufile, segnum, su_bh, kaddr);
-       if (!nilfs_segment_usage_clean(su)) {
-               printk(KERN_CRIT "%s: segment %llu must be clean\n",
+       if (unlikely(!nilfs_segment_usage_clean(su))) {
+               printk(KERN_WARNING "%s: segment %llu must be clean\n",
                       __func__, (unsigned long long)segnum);
-               BUG();
+               kunmap_atomic(kaddr, KM_USER0);
+               goto out_su_bh;
        }
        nilfs_segment_usage_set_dirty(su);
        kunmap_atomic(kaddr, KM_USER0);
@@ -249,11 +250,10 @@ int nilfs_sufile_cancel_free(struct inode *sufile, __u64 segnum)
        nilfs_mdt_mark_buffer_dirty(su_bh);
        nilfs_mdt_mark_dirty(sufile);
 
+ out_su_bh:
        brelse(su_bh);
-
  out_header:
        brelse(header_bh);
-
  out_sem:
        up_write(&NILFS_MDT(sufile)->mi_sem);
        return ret;
@@ -317,7 +317,7 @@ int nilfs_sufile_freev(struct inode *sufile, __u64 *segnum, size_t nsegs)
                kaddr = kmap_atomic(su_bh[i]->b_page, KM_USER0);
                su = nilfs_sufile_block_get_segment_usage(
                        sufile, segnum[i], su_bh[i], kaddr);
-               BUG_ON(nilfs_segment_usage_error(su));
+               WARN_ON(nilfs_segment_usage_error(su));
                nilfs_segment_usage_set_clean(su);
                kunmap_atomic(kaddr, KM_USER0);
                nilfs_mdt_mark_buffer_dirty(su_bh[i]);
@@ -385,8 +385,8 @@ int nilfs_sufile_get_segment_usage(struct inode *sufile, __u64 segnum,
        int ret;
 
        /* segnum is 0 origin */
-       BUG_ON(segnum >= nilfs_sufile_get_nsegments(sufile));
-
+       if (segnum >= nilfs_sufile_get_nsegments(sufile))
+               return -EINVAL;
        down_write(&NILFS_MDT(sufile)->mi_sem);
        ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, &bh);
        if (ret < 0)
@@ -515,6 +515,8 @@ int nilfs_sufile_get_ncleansegs(struct inode *sufile, unsigned long *nsegsp)
  * %-EIO - I/O error.
  *
  * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-EINVAL - Invalid segment usage number.
  */
 int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
 {
@@ -524,8 +526,11 @@ int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
        void *kaddr;
        int ret;
 
-       BUG_ON(segnum >= nilfs_sufile_get_nsegments(sufile));
-
+       if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) {
+               printk(KERN_WARNING "%s: invalid segment number: %llu\n",
+                      __func__, (unsigned long long)segnum);
+               return -EINVAL;
+       }
        down_write(&NILFS_MDT(sufile)->mi_sem);
 
        ret = nilfs_sufile_get_header_block(sufile, &header_bh);
index 2f0e9f7bf152129cf5f1f81f86ba59612009a2f5..d0639a6aae9e4a382c03635666ef45b80bb50c65 100644 (file)
@@ -841,8 +841,11 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent,
 
        if (sb->s_flags & MS_RDONLY) {
                if (nilfs_test_opt(sbi, SNAPSHOT)) {
-                       if (!nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,
-                                                     sbi->s_snapshot_cno)) {
+                       err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,
+                                                      sbi->s_snapshot_cno);
+                       if (err < 0)
+                               goto failed_sbi;
+                       if (!err) {
                                printk(KERN_ERR
                                       "NILFS: The specified checkpoint is "
                                       "not a snapshot "
@@ -1163,7 +1166,6 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
        } else {
                struct nilfs_sb_info *sbi = NILFS_SB(s);
 
-               BUG_ON(!sbi || !sbi->s_nilfs);
                /*
                 * s_umount protects super_block from unmount process;
                 * It covers pointers of nilfs_sb_info and the_nilfs.