From: "Eric W. Biederman" <ebiederm@xmission.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@suse.de>
Cc: <linux-kernel@vger.kernel.org>, Tejun Heo <tj@kernel.org>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
<linux-fsdevel@vger.kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"Eric W. Biederman" <ebiederm@aristanetworks.com>
Subject: [PATCH 06/20] sysfs: Use dentry_ops instead of directly playing with the dcache
Date: Wed, 20 May 2009 17:28:00 -0700 [thread overview]
Message-ID: <1242865694-2100-6-git-send-email-ebiederm@xmission.com> (raw)
In-Reply-To: <1242865694-2100-5-git-send-email-ebiederm@xmission.com>
From: Eric W. Biederman <ebiederm@xmission.com>
Calling d_drop unconditionally when a sysfs_dirent is deleted has
the potential to leak mounts, so instead implement dentry delete
and revalidate operations that cause sysfs dentries to be removed
at the appropriate time.
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
---
fs/sysfs/dir.c | 73 +++++++++++++++++++++++++++++++++++--------------------
1 files changed, 46 insertions(+), 27 deletions(-)
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 01b1e40..8dd2abf 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -294,6 +294,46 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
goto repeat;
}
+static int sysfs_dentry_delete(struct dentry *dentry)
+{
+ struct sysfs_dirent *sd = dentry->d_fsdata;
+ return !!(sd->s_flags & SYSFS_FLAG_REMOVED);
+}
+
+static int sysfs_dentry_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+ struct sysfs_dirent *sd = dentry->d_fsdata;
+ int is_dir;
+
+ mutex_lock(&sysfs_mutex);
+
+ /* The sysfs dirent has been deleted */
+ if (sd->s_flags & SYSFS_FLAG_REMOVED)
+ goto out_bad;
+
+ mutex_unlock(&sysfs_mutex);
+out_valid:
+ return 1;
+out_bad:
+ /* Remove the dentry from the dcache hashes.
+ * If this is a deleted dentry we use d_drop instead of d_delete
+ * so sysfs doesn't need to cope with negative dentries.
+ */
+ is_dir = (sysfs_type(sd) == SYSFS_DIR);
+ mutex_unlock(&sysfs_mutex);
+ if (is_dir) {
+ /* If we have submounts we must allow the vfs caches
+ * to lie about the state of the filesystem to prevent
+ * leaks and other nasty things.
+ */
+ if (have_submounts(dentry))
+ goto out_valid;
+ shrink_dcache_parent(dentry);
+ }
+ d_drop(dentry);
+ return 0;
+}
+
static void sysfs_dentry_iput(struct dentry * dentry, struct inode * inode)
{
struct sysfs_dirent * sd = dentry->d_fsdata;
@@ -303,6 +343,8 @@ static void sysfs_dentry_iput(struct dentry * dentry, struct inode * inode)
}
static const struct dentry_operations sysfs_dentry_ops = {
+ .d_revalidate = sysfs_dentry_revalidate,
+ .d_delete = sysfs_dentry_delete,
.d_iput = sysfs_dentry_iput,
};
@@ -493,44 +535,21 @@ void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
}
/**
- * sysfs_drop_dentry - drop dentry for the specified sysfs_dirent
+ * sysfs_dec_nlink - Decrement link count for the specified sysfs_dirent
* @sd: target sysfs_dirent
*
- * Drop dentry for @sd. @sd must have been unlinked from its
+ * Decrement nlink for @sd. @sd must have been unlinked from its
* parent on entry to this function such that it can't be looked
* up anymore.
*/
-static void sysfs_drop_dentry(struct sysfs_dirent *sd)
+static void sysfs_dec_nlink(struct sysfs_dirent *sd)
{
struct inode *inode;
- struct dentry *dentry;
inode = ilookup(sysfs_sb, sd->s_ino);
if (!inode)
return;
- /* Drop any existing dentries associated with sd.
- *
- * For the dentry to be properly freed we need to grab a
- * reference to the dentry under the dcache lock, unhash it,
- * and then put it. The playing with the dentry count allows
- * dput to immediately free the dentry if it is not in use.
- */
-repeat:
- spin_lock(&dcache_lock);
- list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
- if (d_unhashed(dentry))
- continue;
- dget_locked(dentry);
- spin_lock(&dentry->d_lock);
- __d_drop(dentry);
- spin_unlock(&dentry->d_lock);
- spin_unlock(&dcache_lock);
- dput(dentry);
- goto repeat;
- }
- spin_unlock(&dcache_lock);
-
/* adjust nlink and update timestamp */
mutex_lock(&inode->i_mutex);
@@ -577,7 +596,7 @@ void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
acxt->removed = sd->s_sibling;
sd->s_sibling = NULL;
- sysfs_drop_dentry(sd);
+ sysfs_dec_nlink(sd);
sysfs_deactivate(sd);
unmap_bin_file(sd);
sysfs_put(sd);
--
1.6.1.2.350.g88cc
next prev parent reply other threads:[~2009-05-21 0:28 UTC|newest]
Thread overview: 200+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-20 4:09 [PATCH 0/20] Sysfs cleanups Eric W. Biederman
2009-05-20 15:37 ` Greg KH
2009-05-20 23:04 ` Eric W. Biederman
2009-05-21 0:27 ` [PATCH 01/20] sysfs: Implement sysfs_rename_link Eric W. Biederman
2009-05-21 0:27 ` [PATCH 02/20] driver core: Use sysfs_rename_link in device_rename Eric W. Biederman
2009-05-21 0:27 ` [PATCH 03/20] sysfs: Remove now unnecessary error reporting suppression Eric W. Biederman
2009-05-21 0:27 ` [PATCH 04/20] sysfs: Handle the general case of removing of directories with subdirectories Eric W. Biederman
2009-05-21 0:27 ` [PATCH 05/20] sysfs: Rename sysfs_d_iput to sysfs_dentry_iput Eric W. Biederman
2009-05-21 0:28 ` Eric W. Biederman [this message]
2009-05-21 0:28 ` [PATCH 07/20] sysfs: Simplify sysfs_chmod_file semantics Eric W. Biederman
2009-05-21 0:28 ` [PATCH 08/20] sysfs: Optimize just changing the sysfs file mode Eric W. Biederman
2009-05-21 0:28 ` [PATCH 09/20] sysfs: Simplify iattr assignments Eric W. Biederman
2009-05-21 0:28 ` [PATCH 10/20] sysfs: Fix locking and factor out sysfs_sd_setattr Eric W. Biederman
2009-05-21 0:28 ` [PATCH 11/20] sysfs: Update s_iattr on link and unlink Eric W. Biederman
2009-05-21 0:28 ` [PATCH 12/20] sysfs: Nicely indent sysfs_symlink_inode_operations Eric W. Biederman
2009-05-21 0:28 ` [PATCH 13/20] sysfs: Implement sysfs_getattr & sysfs_permission Eric W. Biederman
2009-05-21 0:28 ` [PATCH 14/20] sysfs: In sysfs_chmod_file lazily propagate the mode change Eric W. Biederman
2009-05-21 0:28 ` [PATCH 15/20] sysfs: Kill sysfs_addrm_start and sysfs_addrm_finish Eric W. Biederman
2009-05-21 0:28 ` [PATCH 16/20] sysfs: Propagate renames to the vfs on demand Eric W. Biederman
2009-05-21 0:28 ` [PATCH 17/20] sysfs: Merge sysfs_rename_dir and sysfs_move_dir Eric W. Biederman
2009-05-21 0:28 ` [PATCH 18/20] sysfs: Pass super_block to sysfs_get_inode Eric W. Biederman
2009-05-21 0:28 ` [PATCH 19/20] sysfs: Kill unused sysfs_sb variable Eric W. Biederman
2009-05-21 0:28 ` [PATCH 20/20] sysfs: Normalize error handling in sysfs_fill_inode Eric W. Biederman
2009-05-21 9:43 ` Tejun Heo
2009-05-21 10:29 ` Eric W. Biederman
2009-05-21 9:42 ` [PATCH 17/20] sysfs: Merge sysfs_rename_dir and sysfs_move_dir Tejun Heo
2009-05-21 9:41 ` [PATCH 16/20] sysfs: Propagate renames to the vfs on demand Tejun Heo
2009-05-21 9:31 ` [PATCH 15/20] sysfs: Kill sysfs_addrm_start and sysfs_addrm_finish Tejun Heo
2009-05-21 9:16 ` [PATCH 14/20] sysfs: In sysfs_chmod_file lazily propagate the mode change Tejun Heo
2009-05-21 9:14 ` [PATCH 13/20] sysfs: Implement sysfs_getattr & sysfs_permission Tejun Heo
2009-05-21 7:42 ` [PATCH 12/20] sysfs: Nicely indent sysfs_symlink_inode_operations Tejun Heo
2009-05-21 8:42 ` [PATCH 11/20] sysfs: Update s_iattr on link and unlink Tejun Heo
2009-05-21 7:42 ` [PATCH 10/20] sysfs: Fix locking and factor out sysfs_sd_setattr Tejun Heo
2009-05-21 7:31 ` [PATCH 09/20] sysfs: Simplify iattr assignments Tejun Heo
2009-05-21 7:29 ` [PATCH 08/20] sysfs: Optimize just changing the sysfs file mode Tejun Heo
2009-05-21 7:54 ` Eric W. Biederman
2009-05-21 8:41 ` Tejun Heo
2009-05-21 6:42 ` [PATCH 07/20] sysfs: Simplify sysfs_chmod_file semantics Tejun Heo
2009-05-21 6:41 ` [PATCH 06/20] sysfs: Use dentry_ops instead of directly playing with the dcache Tejun Heo
2009-05-21 7:37 ` Eric W. Biederman
2009-05-21 7:40 ` Tejun Heo
2009-05-21 6:24 ` [PATCH 05/20] sysfs: Rename sysfs_d_iput to sysfs_dentry_iput Tejun Heo
2009-05-21 6:23 ` [PATCH 04/20] sysfs: Handle the general case of removing of directories with subdirectories Tejun Heo
2009-05-21 7:29 ` Eric W. Biederman
2009-05-21 7:36 ` Tejun Heo
2009-05-21 8:04 ` Eric W. Biederman
2009-05-21 8:37 ` Tejun Heo
2009-05-21 9:18 ` Eric W. Biederman
2009-05-21 9:28 ` Tejun Heo
2009-05-23 6:33 ` Eric W. Biederman
2009-05-23 11:35 ` Kay Sievers
2009-05-23 20:09 ` Eric W. Biederman
2009-05-23 20:46 ` Kay Sievers
2009-05-21 5:37 ` [PATCH 03/20] sysfs: Remove now unnecessary error reporting suppression Tejun Heo
2009-05-21 6:12 ` Eric W. Biederman
2009-05-21 6:20 ` Tejun Heo
2009-05-21 1:49 ` [PATCH 01/20] sysfs: Implement sysfs_rename_link Tejun Heo
2009-05-21 5:35 ` Tejun Heo
2009-05-21 10:06 ` Kay Sievers
2009-05-21 10:29 ` Eric W. Biederman
2009-05-21 11:40 ` Kay Sievers
2009-05-28 0:14 ` Greg KH
2009-05-28 0:30 ` Kay Sievers
2009-05-28 0:37 ` Greg KH
2009-05-28 22:58 ` [PATCH 0/24] sysfs cleanups Eric W. Biederman
2009-05-28 23:00 ` [PATCH 01/24] sysfs: Implement sysfs_rename_link Eric W. Biederman
2009-05-28 23:00 ` [PATCH 02/24] driver core: Use sysfs_rename_link in device_rename Eric W. Biederman
2009-05-28 23:00 ` [PATCH 03/24] sysfs: Remove now unnecessary error reporting suppression Eric W. Biederman
2009-05-28 23:00 ` [PATCH 04/24] sysfs: Normalize removing sysfs directories Eric W. Biederman
2009-05-29 9:14 ` Tejun Heo
2009-05-29 16:52 ` Eric W. Biederman
2009-05-30 10:43 ` Tejun Heo
2009-05-30 13:07 ` Eric W. Biederman
2009-05-30 13:20 ` Tejun Heo
2009-05-30 14:29 ` Eric W. Biederman
2009-05-30 13:59 ` Kay Sievers
2009-05-30 14:19 ` James Bottomley
2009-05-30 15:15 ` Eric W. Biederman
2009-05-30 15:51 ` James Bottomley
2009-05-30 21:20 ` Eric W. Biederman
2009-05-28 23:00 ` [PATCH 05/24] sysfs: Rename sysfs_d_iput to sysfs_dentry_iput Eric W. Biederman
2009-05-28 23:00 ` [PATCH 06/24] sysfs: Use dentry_ops instead of directly playing with the dcache Eric W. Biederman
2009-05-28 23:00 ` [PATCH 07/24] sysfs: Simplify sysfs_chmod_file semantics Eric W. Biederman
2009-05-28 23:00 ` [PATCH 08/24] sysfs: Optimize just changing the sysfs file mode Eric W. Biederman
2009-05-28 23:00 ` [PATCH 09/24] sysfs: Simplify iattr assignments Eric W. Biederman
2009-05-28 23:00 ` [PATCH 10/24] sysfs: Fix locking and factor out sysfs_sd_setattr Eric W. Biederman
2009-05-28 23:00 ` [PATCH 11/24] sysfs: Update s_iattr on link and unlink Eric W. Biederman
2009-05-28 23:00 ` [PATCH 12/24] sysfs: Nicely indent sysfs_symlink_inode_operations Eric W. Biederman
2009-05-28 23:00 ` [PATCH 13/24] sysfs: Implement sysfs_getattr & sysfs_permission Eric W. Biederman
2009-05-28 23:00 ` [PATCH 14/24] sysfs: In sysfs_chmod_file lazily propagate the mode change Eric W. Biederman
2009-05-28 23:00 ` [PATCH 15/24] sysfs: Kill sysfs_addrm_start and sysfs_addrm_finish Eric W. Biederman
2009-05-28 23:00 ` [PATCH 16/24] sysfs: Propagate renames to the vfs on demand Eric W. Biederman
2009-05-28 23:00 ` [PATCH 17/24] sysfs: Merge sysfs_rename_dir and sysfs_move_dir Eric W. Biederman
2009-05-28 23:00 ` [PATCH 18/24] sysfs: Pass super_block to sysfs_get_inode Eric W. Biederman
2009-05-28 23:01 ` [PATCH 19/24] sysfs: Kill unused sysfs_sb variable Eric W. Biederman
2009-05-28 23:01 ` [PATCH 20/24] sysfs: Normalize error handling in sysfs_fill_inode Eric W. Biederman
2009-05-28 23:01 ` [PATCH 21/24] sysfs: Rename sysfs_mv_dir sysfs_rename Eric W. Biederman
2009-05-28 23:01 ` [PATCH 22/24] sysfs: Make sysfs_rename_link atomic Eric W. Biederman
2009-05-29 9:16 ` Tejun Heo
2009-05-29 17:17 ` Eric W. Biederman
2009-05-30 10:48 ` Tejun Heo
2009-05-28 23:01 ` [PATCH 23/24] driver core: Don't remove kobjects in device_shutdown Eric W. Biederman
2009-05-28 23:01 ` [PATCH 24/24] sysfs: In sysfs_add_one fail if the targe directory has been removed Eric W. Biederman
2009-05-29 9:18 ` Tejun Heo
2009-05-29 20:18 ` [PATCH 0/26] sysfs cleanups v3 Eric W. Biederman
2009-05-29 20:19 ` [PATCH 01/26] sysfs: Implement sysfs_rename_link Eric W. Biederman
2009-06-02 22:57 ` patch sysfs-implement-sysfs_rename_link.patch added to gregkh-2.6 tree gregkh
2009-05-29 20:19 ` [PATCH 02/26] driver core: Use sysfs_rename_link in device_rename Eric W. Biederman
2009-06-02 22:57 ` patch driver-core-use-sysfs_rename_link-in-device_rename.patch added to gregkh-2.6 tree gregkh
2009-05-29 20:19 ` [PATCH 03/26] sysfs: Remove now unnecessary error reporting suppression Eric W. Biederman
2009-06-02 22:57 ` patch sysfs-remove-now-unnecessary-error-reporting-suppression.patch added to gregkh-2.6 tree gregkh
2009-05-29 20:19 ` [PATCH 04/26] sysfs: sysfs_remove_dir stop checking for bogus cases Eric W. Biederman
2009-06-03 23:53 ` Greg KH
2009-06-04 0:41 ` Eric W. Biederman
2009-05-29 20:19 ` [PATCH 05/26] sysfs: Improve sysfs directory deletion debugging Eric W. Biederman
2009-05-29 20:19 ` [PATCH 06/26] sysfs: Don't hold addrm_start/addrm_finish over multiple removals Eric W. Biederman
2009-05-29 20:19 ` [PATCH 07/26] sysfs: Rename sysfs_d_iput to sysfs_dentry_iput Eric W. Biederman
2009-05-29 20:19 ` [PATCH 08/26] sysfs: Use dentry_ops instead of directly playing with the dcache Eric W. Biederman
2009-05-29 20:19 ` [PATCH 09/26] sysfs: Simplify sysfs_chmod_file semantics Eric W. Biederman
2009-05-29 20:19 ` [PATCH 10/26] sysfs: Optimize just changing the sysfs file mode Eric W. Biederman
2009-05-29 20:19 ` [PATCH 11/26] sysfs: Simplify iattr assignments Eric W. Biederman
2009-05-29 20:19 ` [PATCH 12/26] sysfs: Fix locking and factor out sysfs_sd_setattr Eric W. Biederman
2009-05-29 20:19 ` [PATCH 13/26] sysfs: Update s_iattr on link and unlink Eric W. Biederman
2009-05-29 20:19 ` [PATCH 14/26] sysfs: Nicely indent sysfs_symlink_inode_operations Eric W. Biederman
2009-05-29 20:19 ` [PATCH 15/26] sysfs: Implement sysfs_getattr & sysfs_permission Eric W. Biederman
2009-05-29 20:19 ` [PATCH 16/26] sysfs: In sysfs_chmod_file lazily propagate the mode change Eric W. Biederman
2009-05-29 20:19 ` [PATCH 17/26] sysfs: Kill sysfs_addrm_start and sysfs_addrm_finish Eric W. Biederman
2009-05-29 20:19 ` [PATCH 18/26] sysfs: Propagate renames to the vfs on demand Eric W. Biederman
2009-05-29 20:19 ` [PATCH 19/26] sysfs: Merge sysfs_rename_dir and sysfs_move_dir Eric W. Biederman
2009-05-29 20:19 ` [PATCH 20/26] sysfs: Pass super_block to sysfs_get_inode Eric W. Biederman
2009-05-29 20:19 ` [PATCH 21/26] sysfs: Kill unused sysfs_sb variable Eric W. Biederman
2009-05-29 20:19 ` [PATCH 22/26] sysfs: Normalize error handling in sysfs_fill_inode Eric W. Biederman
2009-05-29 20:19 ` [PATCH 23/26] sysfs: Rename sysfs_mv_dir sysfs_rename Eric W. Biederman
2009-05-29 20:19 ` [PATCH 24/26] sysfs: Make sysfs_rename_link atomic Eric W. Biederman
2009-05-29 20:19 ` [PATCH 25/26] driver core: Don't remove kobjects in device_shutdown Eric W. Biederman
2009-05-29 20:19 ` [PATCH 26/26] sysfs: In sysfs_add_one fail if the targe directory has been removed Eric W. Biederman
2009-05-28 1:51 ` [PATCH 01/20] sysfs: Implement sysfs_rename_link Eric W. Biederman
2009-05-23 20:13 ` [PATCH 21/20] sysfs: Rename sysfs_mv_dir sysfs_rename Eric W. Biederman
2009-05-23 20:13 ` [PATCH 22/20] sysfs: Make sysfs_rename_link atomic Eric W. Biederman
2009-05-23 21:32 ` Kay Sievers
2009-05-23 23:21 ` Kay Sievers
2009-05-24 13:03 ` Kay Sievers
2009-05-23 20:13 ` [PATCH 23/20] driver core: Don't remove kobjects in device_shutdown Eric W. Biederman
2009-05-23 22:15 ` Kay Sievers
2009-05-23 20:13 ` [PATCH 24/20] sysfs: In sysfs_add_one fail if the targe directory has been removed Eric W. Biederman
2009-05-23 21:29 ` Kay Sievers
2009-05-23 20:13 ` [PATCH 25/20] sysfs: Only support removing emtpy sysfs directories Eric W. Biederman
2009-05-23 21:27 ` Kay Sievers
2009-05-24 12:59 ` Kay Sievers
2009-05-24 14:17 ` Eric W. Biederman
2009-05-24 15:20 ` Kay Sievers
2009-05-25 2:06 ` Alan Stern
2009-05-25 11:45 ` Kay Sievers
2009-05-25 12:01 ` Kay Sievers
2009-05-25 15:49 ` Alan Stern
2009-05-25 18:19 ` Kay Sievers
2009-05-25 20:14 ` Alan Stern
2009-05-26 16:27 ` Kay Sievers
2009-05-26 19:29 ` Alan Stern
2009-05-26 21:09 ` James Bottomley
2009-05-26 21:13 ` Kay Sievers
2009-05-26 21:56 ` Alan Stern
2009-05-26 22:03 ` Kay Sievers
2009-05-26 23:49 ` James Bottomley
2009-05-27 0:02 ` Kay Sievers
2009-05-27 2:17 ` Alan Stern
2009-05-27 11:35 ` Hannes Reinecke
2009-05-27 16:01 ` James Bottomley
2009-05-27 16:16 ` Alan Stern
2009-05-27 16:24 ` James Bottomley
2009-05-27 17:01 ` Alan Stern
2009-05-27 17:08 ` James Bottomley
2009-05-27 18:07 ` Alan Stern
2009-05-27 19:44 ` James Bottomley
2009-05-27 20:40 ` Alan Stern
2009-05-27 20:49 ` James Bottomley
2009-05-27 21:31 ` Alan Stern
2009-05-27 21:42 ` James Bottomley
2009-05-27 22:15 ` Alan Stern
2009-05-27 22:22 ` James Bottomley
2009-05-28 15:24 ` Alan Stern
2009-05-28 15:45 ` Eric W. Biederman
2009-05-28 17:51 ` Alan Stern
2009-05-28 18:21 ` James Bottomley
2009-05-28 20:02 ` Alan Stern
2009-05-28 20:10 ` James Bottomley
2009-05-28 21:04 ` Alan Stern
2009-05-29 12:32 ` Hannes Reinecke
2009-05-29 20:08 ` Alan Stern
2009-05-27 18:00 ` Eric W. Biederman
2009-05-27 18:15 ` Alan Stern
2009-05-27 18:24 ` Eric W. Biederman
2009-05-27 21:38 ` Alan Stern
2009-05-27 22:06 ` Eric W. Biederman
2009-05-27 22:18 ` Alan Stern
2009-05-26 21:39 ` Alan Stern
2009-05-25 7:44 ` Eric W. Biederman
2009-05-25 7:53 ` Eric W. Biederman
2009-05-25 10:51 ` Kay Sievers
2009-05-24 3:24 ` Tejun Heo
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