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| author | Oliver Neukum <oliver@neukum.org> | 2006-12-20 10:52:44 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-02-07 10:37:13 -0800 |
| commit | 94bebf4d1b8e7719f0f3944c037a21cfd99a4af7 (patch) | |
| tree | 25c6ba1836e74f608b4e434b4f0f4d5c28b11de1 /fs/sysfs/mount.c | |
| parent | cb986b749c7178422bfbc982cd30e04d5db54bbc (diff) | |
| download | linux-94bebf4d1b8e7719f0f3944c037a21cfd99a4af7.tar.bz2 | |
Driver core: fix race in sysfs between sysfs_remove_file() and read()/write()
This patch prevents a race between IO and removing a file from sysfs.
It introduces a list of sysfs_buffers associated with a file at the inode.
Upon removal of a file the list is walked and the buffers marked orphaned.
IO to orphaned buffers fails with -ENODEV. The driver can safely free
associated data structures or be unloaded.
Signed-off-by: Oliver Neukum <oliver@neukum.name>
Acked-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/mount.c')
| -rw-r--r-- | fs/sysfs/mount.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c index e503f858fba8..a1a58b97f322 100644 --- a/fs/sysfs/mount.c +++ b/fs/sysfs/mount.c @@ -8,6 +8,7 @@ #include <linux/mount.h> #include <linux/pagemap.h> #include <linux/init.h> +#include <asm/semaphore.h> #include "sysfs.h" @@ -18,9 +19,12 @@ struct vfsmount *sysfs_mount; struct super_block * sysfs_sb = NULL; struct kmem_cache *sysfs_dir_cachep; +static void sysfs_clear_inode(struct inode *inode); + static struct super_operations sysfs_ops = { .statfs = simple_statfs, .drop_inode = generic_delete_inode, + .clear_inode = sysfs_clear_inode, }; static struct sysfs_dirent sysfs_root = { @@ -31,6 +35,11 @@ static struct sysfs_dirent sysfs_root = { .s_iattr = NULL, }; +static void sysfs_clear_inode(struct inode *inode) +{ + kfree(inode->i_private); +} + static int sysfs_fill_super(struct super_block *sb, void *data, int silent) { struct inode *inode; |