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authorJoel Becker <joel.becker@oracle.com>2007-03-28 21:27:07 -0400
committerMark Fasheh <mark.fasheh@oracle.com>2007-05-02 18:07:42 -0400
commitee19a77956cb65c5da54d85a5efefe50b39fa6e5 (patch)
tree1ce4410333f2ad72460cb742d3f5974acb6f9caa /fs
parent6cb129f5675c39944e5fe18fd2530a2eb771b754 (diff)
ocfs2: Wrap access of directory allocations with ip_alloc_sem.
OCFS2_I(inode)->ip_alloc_sem is a read-write semaphore protecting local concurrent access of ocfs2 inodes. However, ocfs2 directories were not taking the semaphore while they accessed or modified the allocation tree. ocfs2_extend_dir() needs to take the semaphore in a write mode when it adds to the allocation. All other directory users get there via ocfs2_bread(), which takes the semaphore in read mode. Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/ocfs2/dir.c7
-rw-r--r--fs/ocfs2/inode.c2
2 files changed, 8 insertions, 1 deletions
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 67e6866a2a4f..c441ef1f2bad 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -403,7 +403,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
403 struct buffer_head **new_de_bh) 403 struct buffer_head **new_de_bh)
404{ 404{
405 int status = 0; 405 int status = 0;
406 int credits, num_free_extents; 406 int credits, num_free_extents, drop_alloc_sem = 0;
407 loff_t dir_i_size; 407 loff_t dir_i_size;
408 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data; 408 struct ocfs2_dinode *fe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
409 struct ocfs2_alloc_context *data_ac = NULL; 409 struct ocfs2_alloc_context *data_ac = NULL;
@@ -452,6 +452,9 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
452 credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS; 452 credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
453 } 453 }
454 454
455 down_write(&OCFS2_I(dir)->ip_alloc_sem);
456 drop_alloc_sem = 1;
457
455 handle = ocfs2_start_trans(osb, credits); 458 handle = ocfs2_start_trans(osb, credits);
456 if (IS_ERR(handle)) { 459 if (IS_ERR(handle)) {
457 status = PTR_ERR(handle); 460 status = PTR_ERR(handle);
@@ -497,6 +500,8 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
497 *new_de_bh = new_bh; 500 *new_de_bh = new_bh;
498 get_bh(*new_de_bh); 501 get_bh(*new_de_bh);
499bail: 502bail:
503 if (drop_alloc_sem)
504 up_write(&OCFS2_I(dir)->ip_alloc_sem);
500 if (handle) 505 if (handle)
501 ocfs2_commit_trans(osb, handle); 506 ocfs2_commit_trans(osb, handle);
502 507
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 21a605079c62..58ec54b60038 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -1106,8 +1106,10 @@ struct buffer_head *ocfs2_bread(struct inode *inode,
1106 return NULL; 1106 return NULL;
1107 } 1107 }
1108 1108
1109 down_read(&OCFS2_I(inode)->ip_alloc_sem);
1109 tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, 1110 tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
1110 NULL); 1111 NULL);
1112 up_read(&OCFS2_I(inode)->ip_alloc_sem);
1111 if (tmperr < 0) { 1113 if (tmperr < 0) {
1112 mlog_errno(tmperr); 1114 mlog_errno(tmperr);
1113 goto fail; 1115 goto fail;