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authorRaghavendra G <raghavendra@gluster.com>2010-05-04 02:28:11 +0000
committerAnand V. Avati <avati@dev.gluster.com>2010-05-04 03:32:14 -0700
commit2f6b222476a6ca0e5d96946876e1a53eccad9fe7 (patch)
treefd3053c89a6092789e5392dba518d2161faecc52 /xlators
parente3ad79741be19d190a1722a27473531edd1498bf (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
Diffstat (limited to 'xlators')
-rw-r--r--xlators/performance/read-ahead/src/read-ahead.c20
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 8e140d8..e4c1ab2 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 mandatory locking has been enabled on this file,
we disable caching on it */
@@ -110,9 +108,16 @@ ra_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
file->page_count = 1;
}
- frame->local = 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:
+ frame->local = NULL;
+
STACK_UNWIND_STRICT (open, frame, op_ret, op_errno, fd);
return 0;
@@ -144,8 +149,6 @@ 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 mandatory locking has been enabled on this file,
we disable caching on it */
@@ -179,6 +182,13 @@ 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);