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authorTejun Heo <htejun@gmail.com>2007-06-14 04:27:24 +0900
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-11 16:09:09 -0700
commitfb6896da37f19be4b75154c14d1cd79231255b17 (patch)
treed1480206694a0642067dc7dc5b40bd63b038cac0 /fs/sysfs/file.c
parent3007e997de91ec59af39a3f9c91595b31ae6e08b (diff)
sysfs: restructure add/remove paths and fix inode update
The original add/remove code had the following problems. * parent's timestamps are updated on dentry instantiation. this is incorrect with reclaimable files. * updating parent's timestamps isn't synchronized. * parent nlink update assumes the inode is accessible which won't be true once directory dentries are made reclaimable. This patch restructures add/remove paths to resolve the above problems. Add/removal are done in the following steps. 1. sysfs_addrm_start() : acquire locks including sysfs_mutex and other resources. 2-a. sysfs_add_one() : add new sd. linking the new sd into the children list is caller's responsibility. 2-b. sysfs_remove_one() : remove a sd. unlinking the sd from the children list is caller's responsibility. 3. sysfs_addrm_finish() : release all resources and clean up. Steps 2-a and/or 2-b can be repeated multiple times. Parent's inode is looked up during sysfs_addrm_start(). If available (always at the moment), it's pinned and nlink is updated as sd's are added and removed. Timestamps are updated during finish if any sd has been added or removed. If parent's inode is not available during start, sysfs_mutex ensures that parent inode is not created till add/remove is complete. All the complexity is contained inside the helper functions. Especially, dentry/inode handling is properly hidden from the rest of sysfs which now mostly operate on sysfs_dirents. As an added bonus, codes which use these helpers to add and remove sysfs_dirents are now more structured and simpler. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/file.c')
-rw-r--r--fs/sysfs/file.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index d0deed3e60b5..69bacf1db596 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -416,6 +416,7 @@ int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
int type)
{
umode_t mode = (attr->mode & S_IALLUGO) | S_IFREG;
+ struct sysfs_addrm_cxt acxt;
struct sysfs_dirent *sd;
sd = sysfs_new_dirent(attr->name, mode, type);
@@ -423,20 +424,18 @@ int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
return -ENOMEM;
sd->s_elem.attr.attr = (void *)attr;
- mutex_lock(&sysfs_mutex);
+ sysfs_addrm_start(&acxt, dir_sd);
if (!sysfs_find_dirent(dir_sd, attr->name)) {
- sysfs_attach_dirent(sd, dir_sd, NULL);
- sd = NULL;
+ sysfs_add_one(&acxt, sd);
+ sysfs_link_sibling(sd);
}
- mutex_unlock(&sysfs_mutex);
+ if (sysfs_addrm_finish(&acxt))
+ return 0;
- if (sd) {
- sysfs_put(sd);
- return -EEXIST;
- }
- return 0;
+ sysfs_put(sd);
+ return -EEXIST;
}