diff options
author | Al Viro <viro@zeniv.linux.org.uk> | 2013-08-24 12:08:17 -0400 |
---|---|---|
committer | Zhangfei Gao <zhangfei.gao@linaro.org> | 2013-11-20 18:52:05 +0800 |
commit | 12335bed6a2c4ec9cb5eb0931b2f4529ddf918fa (patch) | |
tree | 69aa04fb971c09c1bf58e8c43704f0becd090e84 | |
parent | ed9bfd7919285966ffa85bb6b6c5687708ba5835 (diff) |
cope with potentially long ->d_dname() output for shmem/hugetlbtracking-hilt-dumpstate-1120
commit 118b23022512eb2f41ce42db70dc0568d00be4ba upstream.
dynamic_dname() is both too much and too little for those - the
output may be well in excess of 64 bytes dynamic_dname() assumes
to be enough (thanks to ashmem feeding really long names to
shmem_file_setup()) and vsnprintf() is an overkill for those
guys.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Colin Cross <ccross@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | fs/dcache.c | 11 | ||||
-rw-r--r-- | fs/hugetlbfs/inode.c | 8 | ||||
-rw-r--r-- | include/linux/dcache.h | 1 | ||||
-rw-r--r-- | mm/shmem.c | 8 |
4 files changed, 14 insertions, 14 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index f09b9085f7d8..da89cdfb21ab 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -2724,6 +2724,17 @@ char *dynamic_dname(struct dentry *dentry, char *buffer, int buflen, return memcpy(buffer, temp, sz); } +char *simple_dname(struct dentry *dentry, char *buffer, int buflen) +{ + char *end = buffer + buflen; + /* these dentries are never renamed, so d_lock is not needed */ + if (prepend(&end, &buflen, " (deleted)", 11) || + prepend_name(&end, &buflen, &dentry->d_name) || + prepend(&end, &buflen, "/", 1)) + end = ERR_PTR(-ENAMETOOLONG); + return end; +} + /* * Write full pathname from the root of the filesystem into the buffer. */ diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index a3f868ae3fd4..4e5f332f15d9 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -916,14 +916,8 @@ static int get_hstate_idx(int page_size_log) return h - hstates; } -static char *hugetlb_dname(struct dentry *dentry, char *buffer, int buflen) -{ - return dynamic_dname(dentry, buffer, buflen, "/%s (deleted)", - dentry->d_name.name); -} - static struct dentry_operations anon_ops = { - .d_dname = hugetlb_dname + .d_dname = simple_dname }; /* diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 1a6bb81f0fe5..9be5ac960fd8 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -332,6 +332,7 @@ extern int d_validate(struct dentry *, struct dentry *); * helper function for dentry_operations.d_dname() members */ extern char *dynamic_dname(struct dentry *, char *, int, const char *, ...); +extern char *simple_dname(struct dentry *, char *, int); extern char *__d_path(const struct path *, const struct path *, char *, int); extern char *d_absolute_path(const struct path *, char *, int); diff --git a/mm/shmem.c b/mm/shmem.c index 695db3b6216b..6019778b951b 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2879,14 +2879,8 @@ EXPORT_SYMBOL_GPL(shmem_truncate_range); /* common code */ -static char *shmem_dname(struct dentry *dentry, char *buffer, int buflen) -{ - return dynamic_dname(dentry, buffer, buflen, "/%s (deleted)", - dentry->d_name.name); -} - static struct dentry_operations anon_ops = { - .d_dname = shmem_dname + .d_dname = simple_dname }; /** |