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authorJoel Becker <joel.becker@oracle.com>2010-05-10 11:56:52 -0700
committerJoel Becker <joel.becker@oracle.com>2010-05-10 11:56:52 -0700
commit547ba7c8efe43c2cabb38782e23572a6179dd1c1 (patch)
tree66343f838e25938a0c41662716d6eca6eaf6d5cb /fs/ocfs2
parente4b963f10e9026c83419b5c25b93a0350413cf16 (diff)
downloadlinux-547ba7c8efe43c2cabb38782e23572a6179dd1c1.tar.bz2
ocfs2: Block signals for mkdir/link/symlink/O_CREAT.
Once file or link creation gets going, it can't be interrupted by a signal. They're not idempotent. This blocks signals in ocfs2_mknod(), ocfs2_link(), and ocfs2_symlink() once we start actually changing things. ocfs2_mknod() covers mknod(), creat(), mkdir(), and open(O_CREAT). Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs/ocfs2')
-rw-r--r--fs/ocfs2/namei.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 21d4a33d0f0e..607084b349d4 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -239,6 +239,8 @@ static int ocfs2_mknod(struct inode *dir,
};
int did_quota_inode = 0;
struct ocfs2_dir_lookup_result lookup = { NULL, };
+ sigset_t oldset;
+ int did_block_signals = 0;
mlog_entry("(0x%p, 0x%p, %d, %lu, '%.*s')\n", dir, dentry, mode,
(unsigned long)dev, dentry->d_name.len,
@@ -350,6 +352,10 @@ static int ocfs2_mknod(struct inode *dir,
goto leave;
}
+ /* Starting to change things, restart is no longer possible. */
+ ocfs2_block_signals(&oldset);
+ did_block_signals = 1;
+
status = dquot_alloc_inode(inode);
if (status)
goto leave;
@@ -430,6 +436,8 @@ leave:
ocfs2_commit_trans(osb, handle);
ocfs2_inode_unlock(dir, 1);
+ if (did_block_signals)
+ ocfs2_unblock_signals(&oldset);
if (status == -ENOSPC)
mlog(0, "Disk is full\n");
@@ -618,6 +626,7 @@ static int ocfs2_link(struct dentry *old_dentry,
struct ocfs2_dinode *fe = NULL;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
struct ocfs2_dir_lookup_result lookup = { NULL, };
+ sigset_t oldset;
mlog_entry("(inode=%lu, old='%.*s' new='%.*s')\n", inode->i_ino,
old_dentry->d_name.len, old_dentry->d_name.name,
@@ -674,6 +683,9 @@ static int ocfs2_link(struct dentry *old_dentry,
goto out_unlock_inode;
}
+ /* Starting to change things, restart is no longer possible. */
+ ocfs2_block_signals(&oldset);
+
err = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (err < 0) {
@@ -710,6 +722,7 @@ static int ocfs2_link(struct dentry *old_dentry,
out_commit:
ocfs2_commit_trans(osb, handle);
+ ocfs2_unblock_signals(&oldset);
out_unlock_inode:
ocfs2_inode_unlock(inode, 1);
@@ -1568,6 +1581,8 @@ static int ocfs2_symlink(struct inode *dir,
};
int did_quota = 0, did_quota_inode = 0;
struct ocfs2_dir_lookup_result lookup = { NULL, };
+ sigset_t oldset;
+ int did_block_signals = 0;
mlog_entry("(0x%p, 0x%p, symname='%s' actual='%.*s')\n", dir,
dentry, symname, dentry->d_name.len, dentry->d_name.name);
@@ -1663,6 +1678,10 @@ static int ocfs2_symlink(struct inode *dir,
goto bail;
}
+ /* Starting to change things, restart is no longer possible. */
+ ocfs2_block_signals(&oldset);
+ did_block_signals = 1;
+
status = dquot_alloc_inode(inode);
if (status)
goto bail;
@@ -1766,6 +1785,8 @@ bail:
ocfs2_commit_trans(osb, handle);
ocfs2_inode_unlock(dir, 1);
+ if (did_block_signals)
+ ocfs2_unblock_signals(&oldset);
brelse(new_fe_bh);
brelse(parent_fe_bh);