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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>
This commit is contained in:
Ryusuke Konishi 2009-05-30 19:08:09 +09:00
parent fb6e7113ae
commit 30c25be71f
1 changed files with 2 additions and 12 deletions
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14
fs/nilfs2/cpfile.c
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@ -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);
}