diff options
author | Tejun Heo <htejun@gmail.com> | 2007-06-13 14:45:14 -0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-11 19:09:03 -0400 |
commit | 996b73764e9bb9d5e751fd15b130ba38637d66a8 (patch) | |
tree | b8fe0310d1d37da2c2434d1398c12b5ae82b929f /fs | |
parent | dfeb9fb0343363aadc3ee00a9347d120bc2a26b1 (diff) |
sysfs: flatten and fix sysfs_rename_dir() error handling
Error handling in sysfs_rename_dir() was broken.
* When lookup_one_len() fails, 0 is returned.
* If parent inode check fails, returns with inode mutex and rename
rwsem held.
This patch fixes the above bugs and flattens error handling such that
it's more readable and easier to modify.
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/sysfs/dir.c | 73 |
1 files changed, 41 insertions, 32 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index b4c482461403..90bed5df254f 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c | |||
@@ -452,8 +452,9 @@ void sysfs_remove_dir(struct kobject * kobj) | |||
452 | int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent, | 452 | int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent, |
453 | const char *new_name) | 453 | const char *new_name) |
454 | { | 454 | { |
455 | int error = 0; | 455 | int error; |
456 | struct dentry * new_dentry; | 456 | struct dentry * new_dentry; |
457 | struct sysfs_dirent *sd, *parent_sd; | ||
457 | 458 | ||
458 | if (!new_parent) | 459 | if (!new_parent) |
459 | return -EFAULT; | 460 | return -EFAULT; |
@@ -462,40 +463,48 @@ int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent, | |||
462 | mutex_lock(&new_parent->d_inode->i_mutex); | 463 | mutex_lock(&new_parent->d_inode->i_mutex); |
463 | 464 | ||
464 | new_dentry = lookup_one_len(new_name, new_parent, strlen(new_name)); | 465 | new_dentry = lookup_one_len(new_name, new_parent, strlen(new_name)); |
465 | if (!IS_ERR(new_dentry)) { | 466 | if (IS_ERR(new_dentry)) { |
466 | /* By allowing two different directories with the | 467 | error = PTR_ERR(new_dentry); |
467 | * same d_parent we allow this routine to move | 468 | goto out_unlock; |
468 | * between different shadows of the same directory | ||
469 | */ | ||
470 | if (kobj->dentry->d_parent->d_inode != new_parent->d_inode) | ||
471 | return -EINVAL; | ||
472 | else if (new_dentry->d_parent->d_inode != new_parent->d_inode) | ||
473 | error = -EINVAL; | ||
474 | else if (new_dentry == kobj->dentry) | ||
475 | error = -EINVAL; | ||
476 | else if (!new_dentry->d_inode) { | ||
477 | error = kobject_set_name(kobj, "%s", new_name); | ||
478 | if (!error) { | ||
479 | struct sysfs_dirent *sd, *parent_sd; | ||
480 | |||
481 | d_add(new_dentry, NULL); | ||
482 | d_move(kobj->dentry, new_dentry); | ||
483 | |||
484 | sd = kobj->dentry->d_fsdata; | ||
485 | parent_sd = new_parent->d_fsdata; | ||
486 | |||
487 | list_del_init(&sd->s_sibling); | ||
488 | list_add(&sd->s_sibling, &parent_sd->s_children); | ||
489 | } | ||
490 | else | ||
491 | d_drop(new_dentry); | ||
492 | } else | ||
493 | error = -EEXIST; | ||
494 | dput(new_dentry); | ||
495 | } | 469 | } |
470 | |||
471 | /* By allowing two different directories with the same | ||
472 | * d_parent we allow this routine to move between different | ||
473 | * shadows of the same directory | ||
474 | */ | ||
475 | error = -EINVAL; | ||
476 | if (kobj->dentry->d_parent->d_inode != new_parent->d_inode || | ||
477 | new_dentry->d_parent->d_inode != new_parent->d_inode || | ||
478 | new_dentry == kobj->dentry) | ||
479 | goto out_dput; | ||
480 | |||
481 | error = -EEXIST; | ||
482 | if (new_dentry->d_inode) | ||
483 | goto out_dput; | ||
484 | |||
485 | error = kobject_set_name(kobj, "%s", new_name); | ||
486 | if (error) | ||
487 | goto out_drop; | ||
488 | |||
489 | d_add(new_dentry, NULL); | ||
490 | d_move(kobj->dentry, new_dentry); | ||
491 | |||
492 | sd = kobj->dentry->d_fsdata; | ||
493 | parent_sd = new_parent->d_fsdata; | ||
494 | |||
495 | list_del_init(&sd->s_sibling); | ||
496 | list_add(&sd->s_sibling, &parent_sd->s_children); | ||
497 | |||
498 | error = 0; | ||
499 | goto out_unlock; | ||
500 | |||
501 | out_drop: | ||
502 | d_drop(new_dentry); | ||
503 | out_dput: | ||
504 | dput(new_dentry); | ||
505 | out_unlock: | ||
496 | mutex_unlock(&new_parent->d_inode->i_mutex); | 506 | mutex_unlock(&new_parent->d_inode->i_mutex); |
497 | up_write(&sysfs_rename_sem); | 507 | up_write(&sysfs_rename_sem); |
498 | |||
499 | return error; | 508 | return error; |
500 | } | 509 | } |
501 | 510 | ||