[PATCH mmotm 6/6] nilfs2: replace BUG_ON and BUG calls triggerable from ioctl

From: Ryusuke Konishi
Date: Tue Feb 17 2009 - 03:12:59 EST

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.

Cc: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
---
fs/nilfs2/btree.c | 27 ++++++-----------
fs/nilfs2/cpfile.c | 38 +++++++++++++-----------
fs/nilfs2/dat.c | 15 +++++----
fs/nilfs2/direct.c | 13 ++++++--
fs/nilfs2/inode.c | 19 +++---------
fs/nilfs2/ioctl.c | 63 +++++++++++++++++++++++++++-------------
fs/nilfs2/mdt.c | 4 +--
fs/nilfs2/nilfs.h | 1 -
fs/nilfs2/page.c | 10 ++----
fs/nilfs2/recovery.c | 3 --
fs/nilfs2/segment.c | 78 +++++++++++++++-----------------------------------
fs/nilfs2/sufile.c | 25 +++++++++------
fs/nilfs2/super.c | 8 +++--
13 files changed, 144 insertions(+), 160 deletions(-)

diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c
index 53f0d4c..6b37a27 100644
--- a/fs/nilfs2/btree.c
+++ b/fs/nilfs2/btree.c
@@ -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;
}

diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index eb9b2d8..2e3b066 100644
--- a/fs/nilfs2/cpfile.c
+++ b/fs/nilfs2/cpfile.c
@@ -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) {
@@ -526,9 +527,6 @@ 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;
@@ -576,6 +574,8 @@ 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);
@@ -692,6 +692,8 @@ 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);
@@ -807,6 +809,8 @@ 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);
diff --git a/fs/nilfs2/dat.c b/fs/nilfs2/dat.c
index 9360920..bb8a581 100644
--- a/fs/nilfs2/dat.c
+++ b/fs/nilfs2/dat.c
@@ -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);

diff --git a/fs/nilfs2/direct.c b/fs/nilfs2/direct.c
index e3ec248..c6379e4 100644
--- a/fs/nilfs2/direct.c
+++ b/fs/nilfs2/direct.c
@@ -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);
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 4bf1e2c..b6536bb 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -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);

diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index cfb2789..108d281 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -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;
}

diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index e0a632b..47dd815 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -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);
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index f865ecb..84e747d 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -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;
}

diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 7b18be8..1bfbba9 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -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 {
diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c
index a4253f3..ef387b1 100644
--- a/fs/nilfs2/recovery.c
+++ b/fs/nilfs2/recovery.c
@@ -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;
}
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 24d0fbd..9a87410 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -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);
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index cc714c7..4cf47e0 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -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);
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 2f0e9f7..d0639a6 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -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.
--
1.5.6.5

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