diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2015-02-21 22:05:11 -0500 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2015-03-14 15:37:27 -0400 |
| commit | c74eb981faeac66ad77545ecab2ed54d5b6fbe6e (patch) | |
| tree | 3c49e9ddbf3b00bc10b8dea5f5f285a232f97ee0 /fs | |
| parent | be9eb995384f8f619ab5255b29ba35c3b4780bed (diff) | |
debugfs: leave freeing a symlink body until inode eviction
commit 0db59e59299f0b67450c5db21f7f316c8fb04e84 upstream.
As it is, we have debugfs_remove() racing with symlink traversals.
Supply ->evict_inode() and do freeing there - inode will remain
pinned until we are done with the symlink body.
And rip the idiocy with checking if dentry is positive right after
we'd verified debugfs_positive(), which is a stronger check...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/debugfs/inode.c | 34 |
1 files changed, 17 insertions, 17 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index 05f2960ed7c3..6f0ce531e221 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -246,10 +246,19 @@ static int debugfs_show_options(struct seq_file *m, struct dentry *root) return 0; } +static void debugfs_evict_inode(struct inode *inode) +{ + truncate_inode_pages_final(&inode->i_data); + clear_inode(inode); + if (S_ISLNK(inode->i_mode)) + kfree(inode->i_private); +} + static const struct super_operations debugfs_super_operations = { .statfs = simple_statfs, .remount_fs = debugfs_remount, .show_options = debugfs_show_options, + .evict_inode = debugfs_evict_inode, }; static int debug_fill_super(struct super_block *sb, void *data, int silent) @@ -466,23 +475,14 @@ static int __debugfs_remove(struct dentry *dentry, struct dentry *parent) int ret = 0; if (debugfs_positive(dentry)) { - if (dentry->d_inode) { - dget(dentry); - switch (dentry->d_inode->i_mode & S_IFMT) { - case S_IFDIR: - ret = simple_rmdir(parent->d_inode, dentry); - break; - case S_IFLNK: - kfree(dentry->d_inode->i_private); - /* fall through */ - default: - simple_unlink(parent->d_inode, dentry); - break; - } - if (!ret) - d_delete(dentry); - dput(dentry); - } + dget(dentry); + if (S_ISDIR(dentry->d_inode->i_mode)) + ret = simple_rmdir(parent->d_inode, dentry); + else + simple_unlink(parent->d_inode, dentry); + if (!ret) + d_delete(dentry); + dput(dentry); } return ret; } |