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author | Michael Halcrow <mhalcrow@us.ibm.com> | 2006-10-31 06:07:20 (GMT) |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-31 16:07:01 (GMT) |
commit | 45ec4ababe999cb95f9c0cad03b2689cb0b77a2b (patch) | |
tree | 8d2ff3c5c356539bc87777948822741ca488ea6b /fs/ecryptfs/inode.c | |
parent | 316bb95e8ed0ddcd767e8aa54264b6c6190f150c (diff) | |
download | linux-fsl-qoriq-45ec4ababe999cb95f9c0cad03b2689cb0b77a2b.tar.xz |
[PATCH] eCryptfs: Fix handling of lower d_count
Fix the use of dget/dput calls to balance out on the lower filesystem.
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/ecryptfs/inode.c')
-rw-r--r-- | fs/ecryptfs/inode.c | 62 |
1 files changed, 20 insertions, 42 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 2f2c6cf..ff4865d 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -325,7 +325,6 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, struct dentry *lower_dir_dentry; struct dentry *lower_dentry; struct vfsmount *lower_mnt; - struct dentry *tlower_dentry = NULL; char *encoded_name; unsigned int encoded_namelen; struct ecryptfs_crypt_stat *crypt_stat = NULL; @@ -336,27 +335,32 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); dentry->d_op = &ecryptfs_dops; if ((dentry->d_name.len == 1 && !strcmp(dentry->d_name.name, ".")) - || (dentry->d_name.len == 2 && !strcmp(dentry->d_name.name, ".."))) - goto out_drop; + || (dentry->d_name.len == 2 + && !strcmp(dentry->d_name.name, ".."))) { + d_drop(dentry); + goto out; + } encoded_namelen = ecryptfs_encode_filename(crypt_stat, dentry->d_name.name, dentry->d_name.len, &encoded_name); if (encoded_namelen < 0) { rc = encoded_namelen; - goto out_drop; + d_drop(dentry); + goto out; } ecryptfs_printk(KERN_DEBUG, "encoded_name = [%s]; encoded_namelen " "= [%d]\n", encoded_name, encoded_namelen); lower_dentry = lookup_one_len(encoded_name, lower_dir_dentry, encoded_namelen - 1); kfree(encoded_name); - lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); if (IS_ERR(lower_dentry)) { ecryptfs_printk(KERN_ERR, "ERR from lower_dentry\n"); rc = PTR_ERR(lower_dentry); - goto out_drop; + d_drop(dentry); + goto out; } + lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); ecryptfs_printk(KERN_DEBUG, "lower_dentry = [%p]; lower_dentry->" "d_name.name = [%s]\n", lower_dentry, lower_dentry->d_name.name); @@ -397,12 +401,6 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, "as we *think* we are about to unlink\n"); goto out; } - tlower_dentry = dget(lower_dentry); - if (!tlower_dentry || IS_ERR(tlower_dentry)) { - rc = -ENOMEM; - ecryptfs_printk(KERN_ERR, "Cannot dget lower_dentry\n"); - goto out_dput; - } /* Released in this function */ page_virt = (char *)kmem_cache_alloc(ecryptfs_header_cache_2, @@ -414,7 +412,7 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, goto out_dput; } memset(page_virt, 0, PAGE_CACHE_SIZE); - rc = ecryptfs_read_header_region(page_virt, tlower_dentry, nd->mnt); + rc = ecryptfs_read_header_region(page_virt, lower_dentry, nd->mnt); crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED)) ecryptfs_set_default_sizes(crypt_stat); @@ -437,9 +435,6 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry, out_dput: dput(lower_dentry); - if (tlower_dentry) - dput(tlower_dentry); -out_drop: d_drop(dentry); out: return ERR_PTR(rc); @@ -475,8 +470,8 @@ out_lock: unlock_dir(lower_dir_dentry); dput(lower_new_dentry); dput(lower_old_dentry); - if (!new_dentry->d_inode) - d_drop(new_dentry); + d_drop(new_dentry); + d_drop(old_dentry); return rc; } @@ -565,41 +560,24 @@ out: static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) { - int rc = 0; - struct dentry *tdentry = NULL; struct dentry *lower_dentry; - struct dentry *tlower_dentry = NULL; struct dentry *lower_dir_dentry; + int rc; lower_dentry = ecryptfs_dentry_to_lower(dentry); - if (!(tdentry = dget(dentry))) { - rc = -EINVAL; - ecryptfs_printk(KERN_ERR, "Error dget'ing dentry [%p]\n", - dentry); - goto out; - } + dget(dentry); lower_dir_dentry = lock_parent(lower_dentry); - if (!(tlower_dentry = dget(lower_dentry))) { - rc = -EINVAL; - ecryptfs_printk(KERN_ERR, "Error dget'ing lower_dentry " - "[%p]\n", lower_dentry); - goto out; - } + dget(lower_dentry); rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); - if (!rc) { - d_delete(tlower_dentry); - tlower_dentry = NULL; - } + dput(lower_dentry); + if (!rc) + d_delete(lower_dentry); ecryptfs_copy_attr_times(dir, lower_dir_dentry->d_inode); dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; unlock_dir(lower_dir_dentry); if (!rc) d_drop(dentry); -out: - if (tdentry) - dput(tdentry); - if (tlower_dentry) - dput(tlower_dentry); + dput(dentry); return rc; } |