diff options
| author | Raghavendra G <raghavendra@gluster.com> | 2010-05-04 02:29:22 +0000 |
|---|---|---|
| committer | Anand V. Avati <avati@dev.gluster.com> | 2010-05-04 03:32:05 -0700 |
| commit | 3954ddddfe6c600ff2bb8d70463bc6fb4fe67225 (patch) | |
| tree | 46bdee638be2747219aa48f1ac1493d351aa4957 | |
| parent | bb4955c4e12618171ae69c4161db709ff7d29981 (diff) | |
performance/read-ahead: don't set ra_file in fd->ctx unless all memebers of ra_file is initialized
- If ptr to ra_file is set in fd->ctx even before initializing all its
members, A race condition may occur b/w a thread executing ra_fstat,
ra_readv etc (where all files open on the same inode are flushed) and
the thread doing initialization of ra_file (in ra_open_cbk or
ra_create_cbk). Because of this race-condition, flush_region might be
called on an uninitialized ra_file, thereby causing crash.
Signed-off-by: Raghavendra G <raghavendra@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>
BUG: 868 (crash in ra_fstat)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=868
| -rw-r--r-- | xlators/performance/read-ahead/src/read-ahead.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/xlators/performance/read-ahead/src/read-ahead.c b/xlators/performance/read-ahead/src/read-ahead.c index 4f38229025f..7250a9d5996 100644 --- a/xlators/performance/read-ahead/src/read-ahead.c +++ b/xlators/performance/read-ahead/src/read-ahead.c @@ -68,8 +68,6 @@ ra_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this, goto unwind; } - ret = fd_ctx_set (fd, this, (uint64_t)(long)file); - /* If O_DIRECT open, we disable caching on it */ if ((fd->flags & O_DIRECT) || ((fd->flags & O_ACCMODE) == O_WRONLY)) @@ -104,9 +102,16 @@ ra_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this, file->page_count = 1; } + ret = fd_ctx_set (fd, this, (uint64_t)(long)file); + if (ret == -1) { + ra_file_destroy (file); + op_ret = -1; + op_errno = ENOMEM; + } + +unwind: frame->local = NULL; -unwind: STACK_UNWIND_STRICT (open, frame, op_ret, op_errno, fd); return 0; @@ -138,8 +143,6 @@ ra_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this, goto unwind; } - ret = fd_ctx_set (fd, this, (uint64_t)(long)file); - /* If O_DIRECT open, we disable caching on it */ if ((fd->flags & O_DIRECT) || ((fd->flags & O_ACCMODE) == O_WRONLY)) @@ -167,6 +170,13 @@ ra_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this, file->page_size = conf->page_size; pthread_mutex_init (&file->file_lock, NULL); + ret = fd_ctx_set (fd, this, (uint64_t)(long)file); + if (ret == -1) { + ra_file_destroy (file); + op_ret = -1; + op_errno = ENOMEM; + } + unwind: STACK_UNWIND_STRICT (create, frame, op_ret, op_errno, fd, inode, buf, preparent, postparent); |