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| author | David Woodhouse <David.Woodhouse@intel.com> | 2010-06-03 08:09:12 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2010-06-03 08:22:04 +0100 |
| commit | e72e6497e74811e01d72b4c1b7537b3aea3ee857 (patch) | |
| tree | d78dec67d0aaeea807e5ab32141802620ec7ae41 /fs/jffs2 | |
| parent | f324e4cb2cadd9a42932c8a158e761ae31b88e72 (diff) | |
| download | lwn-e72e6497e74811e01d72b4c1b7537b3aea3ee857.tar.gz lwn-e72e6497e74811e01d72b4c1b7537b3aea3ee857.zip | |
jffs2: Fix NFS race by using insert_inode_locked()
New inodes need to be locked as we're creating them, so they don't get used
by other things (like NFSd) before they're ready.
Pointed out by Al Viro.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'fs/jffs2')
| -rw-r--r-- | fs/jffs2/dir.c | 12 | ||||
| -rw-r--r-- | fs/jffs2/fs.c | 7 |
2 files changed, 16 insertions, 3 deletions
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c index cb7ef34d384c..166062a68230 100644 --- a/fs/jffs2/dir.c +++ b/fs/jffs2/dir.c @@ -222,15 +222,18 @@ static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); jffs2_free_raw_inode(ri); - d_instantiate(dentry, inode); D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->pino_nlink, inode->i_mapping->nrpages)); + + d_instantiate(dentry, inode); + unlock_new_inode(inode); return 0; fail: make_bad_inode(inode); + unlock_new_inode(inode); iput(inode); jffs2_free_raw_inode(ri); return ret; @@ -447,10 +450,12 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char jffs2_complete_reservation(c); d_instantiate(dentry, inode); + unlock_new_inode(inode); return 0; fail: make_bad_inode(inode); + unlock_new_inode(inode); iput(inode); return ret; } @@ -592,10 +597,12 @@ static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) jffs2_complete_reservation(c); d_instantiate(dentry, inode); + unlock_new_inode(inode); return 0; fail: make_bad_inode(inode); + unlock_new_inode(inode); iput(inode); return ret; } @@ -767,11 +774,12 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, de jffs2_complete_reservation(c); d_instantiate(dentry, inode); - + unlock_new_inode(inode); return 0; fail: make_bad_inode(inode); + unlock_new_inode(inode); iput(inode); return ret; } diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c index 86e0821fc989..26037e2d6154 100644 --- a/fs/jffs2/fs.c +++ b/fs/jffs2/fs.c @@ -465,7 +465,12 @@ struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_i inode->i_blocks = 0; inode->i_size = 0; - insert_inode_hash(inode); + if (insert_inode_locked(inode) < 0) { + make_bad_inode(inode); + unlock_new_inode(inode); + iput(inode); + return ERR_PTR(-EINVAL); + } return inode; } |