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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-04-06 19:01:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 08:31:19 -0700
commit1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b (patch)
treef80e97297d5badebd31bbb17003d76a4ea30453a /fs/nilfs2/cpfile.c
parent2c2e52fc4fca251e68f90821c9ff5cb18be4df58 (diff)
downloadlinux-1f5abe7e7dbcd83e73212c6cb135a6106cea6a0b.tar.bz2
nilfs2: replace BUG_ON and BUG calls triggerable from ioctl
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>
Diffstat (limited to 'fs/nilfs2/cpfile.c')
-rw-r--r--fs/nilfs2/cpfile.c38
1 files changed, 21 insertions, 17 deletions
diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index 218b34418508..e90b60dfced9 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) {
@@ -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);