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| author | Joel Becker <joel.becker@oracle.com> | 2006-09-13 22:01:19 +0400 |
|---|---|---|
| committer | Mark Fasheh <mark.fasheh@oracle.com> | 2006-09-21 02:46:14 +0400 |
| commit | b4c98f625fffee3a6f633082e9e4be3e952ca2ab (patch) | |
| tree | ff7832706aeab7b16cbe18dd7976be7b56c49e55 /fs/configfs | |
| parent | e478bec0ba0a83a48a0f6982934b6de079e7e6b3 (diff) | |
| download | linux-b4c98f625fffee3a6f633082e9e4be3e952ca2ab.tar.xz | |
configfs: Prevent duplicate subsystem names.
For all child objects, creation comes through mkdir(2), so duplicate names
are prevented.
Subsystems, though, are registered by client drivers at init_module()/__init
time. This patch prevents duplicate subsystem names.
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs/configfs')
| -rw-r--r-- | fs/configfs/dir.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index df025453dd97..816e8ef64560 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -86,6 +86,32 @@ static struct configfs_dirent *configfs_new_dirent(struct configfs_dirent * pare return sd; } +/* + * + * Return -EEXIST if there is already a configfs element with the same + * name for the same parent. + * + * called with parent inode's i_mutex held + */ +int configfs_dirent_exists(struct configfs_dirent *parent_sd, + const unsigned char *new) +{ + struct configfs_dirent * sd; + + list_for_each_entry(sd, &parent_sd->s_children, s_sibling) { + if (sd->s_element) { + const unsigned char *existing = configfs_get_name(sd); + if (strcmp(existing, new)) + continue; + else + return -EEXIST; + } + } + + return 0; +} + + int configfs_make_dirent(struct configfs_dirent * parent_sd, struct dentry * dentry, void * element, umode_t mode, int type) @@ -136,8 +162,10 @@ static int create_dir(struct config_item * k, struct dentry * p, int error; umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; - error = configfs_make_dirent(p->d_fsdata, d, k, mode, - CONFIGFS_DIR); + error = configfs_dirent_exists(p->d_fsdata, d->d_name.name); + if (!error) + error = configfs_make_dirent(p->d_fsdata, d, k, mode, + CONFIGFS_DIR); if (!error) { error = configfs_create(d, mode, init_dir); if (!error) { |