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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-05-30 12:08:09 +0200
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-06-10 16:41:12 +0200
commit30c25be71fcbd87fd33518045cc014e69bff3d6f (patch)
tree89b9ea993834f57b7390a24fdfacf6099b854b54 /fs/nilfs2/cpfile.c
parentnilfs2: modify list of unsupported features in caveats (diff)
downloadlinux-30c25be71fcbd87fd33518045cc014e69bff3d6f.tar.xz
linux-30c25be71fcbd87fd33518045cc014e69bff3d6f.zip
nilfs2: return EBUSY against delete request on snapshot
This helps userland programs like the rmcp command to distinguish error codes returned against a checkpoint removal request. Previously -EPERM was returned, and not discriminable from real permission errors. This also allows removal of the latest checkpoint because the deletion leads to create a new checkpoint, and thus it's harmless for the filesystem. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/cpfile.c')
-rw-r--r--fs/nilfs2/cpfile.c14
1 files changed, 2 insertions, 12 deletions
diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index b5a8cd6b474f..4184c1c2992c 100644
--- a/fs/nilfs2/cpfile.c
+++ b/fs/nilfs2/cpfile.c
@@ -295,10 +295,6 @@ int nilfs_cpfile_delete_checkpoints(struct inode *cpfile,
return -EINVAL;
}
- /* cannot delete the latest checkpoint */
- if (start == nilfs_mdt_cno(cpfile) - 1)
- return -EPERM;
-
down_write(&NILFS_MDT(cpfile)->mi_sem);
ret = nilfs_cpfile_get_header_block(cpfile, &header_bh);
@@ -542,20 +538,14 @@ int nilfs_cpfile_delete_checkpoint(struct inode *cpfile, __u64 cno)
struct nilfs_cpinfo ci;
__u64 tcno = cno;
ssize_t nci;
- int ret;
nci = nilfs_cpfile_do_get_cpinfo(cpfile, &tcno, &ci, sizeof(ci), 1);
if (nci < 0)
return nci;
else if (nci == 0 || ci.ci_cno != cno)
return -ENOENT;
-
- /* cannot delete the latest checkpoint nor snapshots */
- ret = nilfs_cpinfo_snapshot(&ci);
- if (ret < 0)
- return ret;
- else if (ret > 0 || cno == nilfs_mdt_cno(cpfile) - 1)
- return -EPERM;
+ else if (nilfs_cpinfo_snapshot(&ci))
+ return -EBUSY;
return nilfs_cpfile_delete_checkpoints(cpfile, cno, cno + 1);
}