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VFS: Cachefiles should perform fs modifications on the top layer only

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Cachefiles should perform fs modifications (eg. vfs_unlink()) on the top layer
only and should not attempt to alter the lower layer.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2015-03-06 14:08:58 +00:00 committed by Al Viro
parent ee8ac4d61c
commit 5153bc817c
2 changed files with 28 additions and 28 deletions
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4
fs/cachefiles/interface.c
View File

@ -446,7 +446,7 @@ static int cachefiles_attr_changed(struct fscache_object *_object)
return 0;
cachefiles_begin_secure(cache, &saved_cred);
mutex_lock(&object->backer->d_inode->i_mutex);
mutex_lock(&d_inode(object->backer)->i_mutex);
/* if there's an extension to a partial page at the end of the backing
* file, we need to discard the partial page so that we pick up new
@ -465,7 +465,7 @@ static int cachefiles_attr_changed(struct fscache_object *_object)
ret = notify_change(object->backer, &newattrs, NULL);
truncate_failed:
mutex_unlock(&object->backer->d_inode->i_mutex);
mutex_unlock(&d_inode(object->backer)->i_mutex);
cachefiles_end_secure(cache, saved_cred);
if (ret == -EIO) {

52
fs/cachefiles/namei.c
View File

@ -286,13 +286,13 @@ static int cachefiles_bury_object(struct cachefiles_cache *cache,
if (ret < 0) {
cachefiles_io_error(cache, "Unlink security error");
} else {
ret = vfs_unlink(dir->d_inode, rep, NULL);
ret = vfs_unlink(d_inode(dir), rep, NULL);
if (preemptive)
cachefiles_mark_object_buried(cache, rep);
}
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
if (ret == -EIO)
cachefiles_io_error(cache, "Unlink failed");
@ -303,7 +303,7 @@ static int cachefiles_bury_object(struct cachefiles_cache *cache,
/* directories have to be moved to the graveyard */
_debug("move stale object to graveyard");
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
try_again:
/* first step is to make up a grave dentry in the graveyard */
@ -387,8 +387,8 @@ try_again:
if (ret < 0) {
cachefiles_io_error(cache, "Rename security error %d", ret);
} else {
ret = vfs_rename(dir->d_inode, rep,
cache->graveyard->d_inode, grave, NULL, 0);
ret = vfs_rename(d_inode(dir), rep,
d_inode(cache->graveyard), grave, NULL, 0);
if (ret != 0 && ret != -ENOMEM)
cachefiles_io_error(cache,
"Rename failed with error %d", ret);
@ -420,13 +420,13 @@ int cachefiles_delete_object(struct cachefiles_cache *cache,
dir = dget_parent(object->dentry);
mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_PARENT);
if (test_bit(CACHEFILES_OBJECT_BURIED, &object->flags)) {
/* object allocation for the same key preemptively deleted this
* object's file so that it could create its own file */
_debug("object preemptively buried");
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
ret = 0;
} else {
/* we need to check that our parent is _still_ our parent - it
@ -438,7 +438,7 @@ int cachefiles_delete_object(struct cachefiles_cache *cache,
/* it got moved, presumably by cachefilesd culling it,
* so it's no longer in the key path and we can ignore
* it */
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
ret = 0;
}
}
@ -497,7 +497,7 @@ lookup_again:
/* search the current directory for the element name */
_debug("lookup '%s'", name);
mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_PARENT);
start = jiffies;
next = lookup_one_len(name, dir, nlen);
@ -529,7 +529,7 @@ lookup_again:
if (ret < 0)
goto create_error;
start = jiffies;
ret = vfs_mkdir(dir->d_inode, next, 0);
ret = vfs_mkdir(d_inode(dir), next, 0);
cachefiles_hist(cachefiles_mkdir_histogram, start);
if (ret < 0)
goto create_error;
@ -558,7 +558,7 @@ lookup_again:
if (ret < 0)
goto create_error;
start = jiffies;
ret = vfs_create(dir->d_inode, next, S_IFREG, true);
ret = vfs_create(d_inode(dir), next, S_IFREG, true);
cachefiles_hist(cachefiles_create_histogram, start);
if (ret < 0)
goto create_error;
@ -581,7 +581,7 @@ lookup_again:
/* process the next component */
if (key) {
_debug("advance");
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
dput(dir);
dir = next;
next = NULL;
@ -617,7 +617,7 @@ lookup_again:
/* note that we're now using this object */
ret = cachefiles_mark_object_active(cache, object);
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
dput(dir);
dir = NULL;
@ -695,7 +695,7 @@ lookup_error:
cachefiles_io_error(cache, "Lookup failed");
next = NULL;
error:
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
dput(next);
error_out2:
dput(dir);
@ -719,7 +719,7 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
_enter(",,%s", dirname);
/* search the current directory for the element name */
mutex_lock(&dir->d_inode->i_mutex);
mutex_lock(&d_inode(dir)->i_mutex);
start = jiffies;
subdir = lookup_one_len(dirname, dir, strlen(dirname));
@ -746,7 +746,7 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
ret = security_path_mkdir(&path, subdir, 0700);
if (ret < 0)
goto mkdir_error;
ret = vfs_mkdir(dir->d_inode, subdir, 0700);
ret = vfs_mkdir(d_inode(dir), subdir, 0700);
if (ret < 0)
goto mkdir_error;
@ -758,7 +758,7 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
subdir->d_inode->i_ino);
}
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
/* we need to make sure the subdir is a directory */
ASSERT(subdir->d_inode);
@ -790,19 +790,19 @@ check_error:
return ERR_PTR(ret);
mkdir_error:
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
dput(subdir);
pr_err("mkdir %s failed with error %d\n", dirname, ret);
return ERR_PTR(ret);
lookup_error:
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
ret = PTR_ERR(subdir);
pr_err("Lookup %s failed with error %d\n", dirname, ret);
return ERR_PTR(ret);
nomem_d_alloc:
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
_leave(" = -ENOMEM");
return ERR_PTR(-ENOMEM);
}
@ -827,7 +827,7 @@ static struct dentry *cachefiles_check_active(struct cachefiles_cache *cache,
// dir, filename);
/* look up the victim */
mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_PARENT);
start = jiffies;
victim = lookup_one_len(filename, dir, strlen(filename));
@ -842,7 +842,7 @@ static struct dentry *cachefiles_check_active(struct cachefiles_cache *cache,
* at the netfs's request whilst the cull was in progress
*/
if (!victim->d_inode) {
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
dput(victim);
_leave(" = -ENOENT [absent]");
return ERR_PTR(-ENOENT);
@ -871,13 +871,13 @@ static struct dentry *cachefiles_check_active(struct cachefiles_cache *cache,
object_in_use:
read_unlock(&cache->active_lock);
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
dput(victim);
//_leave(" = -EBUSY [in use]");
return ERR_PTR(-EBUSY);
lookup_error:
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
ret = PTR_ERR(victim);
if (ret == -ENOENT) {
/* file or dir now absent - probably retired by netfs */
@ -936,7 +936,7 @@ int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
return 0;
error_unlock:
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
error:
dput(victim);
if (ret == -ENOENT) {
@ -971,7 +971,7 @@ int cachefiles_check_in_use(struct cachefiles_cache *cache, struct dentry *dir,
if (IS_ERR(victim))
return PTR_ERR(victim);
mutex_unlock(&dir->d_inode->i_mutex);
mutex_unlock(&d_inode(dir)->i_mutex);
dput(victim);
//_leave(" = 0");
return 0;