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authorJoel Becker <joel.becker@oracle.com>2009-09-02 17:17:36 -0700
committerJoel Becker <joel.becker@oracle.com>2010-05-10 11:50:10 -0700
commite4b963f10e9026c83419b5c25b93a0350413cf16 (patch)
treed162595c9f79626d040cb28c84e53fd8b7fe50ff
parent0467ae954d1843de65e7cf8f706f88fe65cd8418 (diff)
ocfs2: Wrap signal blocking in void functions.
ocfs2 sometimes needs to block signals around dlm operations, but it currently does it with sigprocmask(). Even worse, it's checking the error code of sigprocmask(). The in-kernel sigprocmask() can only error if you get the SIG_* argument wrong. We don't. Wrap the sigprocmask() calls with ocfs2_[un]block_signals(). These functions are void, but they will BUG() if somehow sigprocmask() returns an error. Signed-off-by: Joel Becker <joel.becker@oracle.com>
-rw-r--r--fs/ocfs2/inode.c14
-rw-r--r--fs/ocfs2/mmap.c48
-rw-r--r--fs/ocfs2/super.c20
-rw-r--r--fs/ocfs2/super.h7
4 files changed, 39 insertions, 50 deletions
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 9ee13f70da5..b7650ccd76d 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -957,7 +957,7 @@ static void ocfs2_cleanup_delete_inode(struct inode *inode,
void ocfs2_delete_inode(struct inode *inode)
{
int wipe, status;
- sigset_t blocked, oldset;
+ sigset_t oldset;
struct buffer_head *di_bh = NULL;
mlog_entry("(inode->i_ino = %lu)\n", inode->i_ino);
@@ -984,13 +984,7 @@ void ocfs2_delete_inode(struct inode *inode)
* messaging paths may return us -ERESTARTSYS. Which would
* cause us to exit early, resulting in inodes being orphaned
* forever. */
- sigfillset(&blocked);
- status = sigprocmask(SIG_BLOCK, &blocked, &oldset);
- if (status < 0) {
- mlog_errno(status);
- ocfs2_cleanup_delete_inode(inode, 1);
- goto bail;
- }
+ ocfs2_block_signals(&oldset);
/*
* Synchronize us against ocfs2_get_dentry. We take this in
@@ -1064,9 +1058,7 @@ bail_unlock_nfs_sync:
ocfs2_nfs_sync_unlock(OCFS2_SB(inode->i_sb), 0);
bail_unblock:
- status = sigprocmask(SIG_SETMASK, &oldset, NULL);
- if (status < 0)
- mlog_errno(status);
+ ocfs2_unblock_signals(&oldset);
bail:
clear_inode(inode);
mlog_exit_void();
diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c
index 39737613424..a61809f8eab 100644
--- a/fs/ocfs2/mmap.c
+++ b/fs/ocfs2/mmap.c
@@ -42,44 +42,20 @@
#include "file.h"
#include "inode.h"
#include "mmap.h"
+#include "super.h"
-static inline int ocfs2_vm_op_block_sigs(sigset_t *blocked, sigset_t *oldset)
-{
- /* The best way to deal with signals in the vm path is
- * to block them upfront, rather than allowing the
- * locking paths to return -ERESTARTSYS. */
- sigfillset(blocked);
-
- /* We should technically never get a bad return value
- * from sigprocmask */
- return sigprocmask(SIG_BLOCK, blocked, oldset);
-}
-
-static inline int ocfs2_vm_op_unblock_sigs(sigset_t *oldset)
-{
- return sigprocmask(SIG_SETMASK, oldset, NULL);
-}
static int ocfs2_fault(struct vm_area_struct *area, struct vm_fault *vmf)
{
- sigset_t blocked, oldset;
- int error, ret;
+ sigset_t oldset;
+ int ret;
mlog_entry("(area=%p, page offset=%lu)\n", area, vmf->pgoff);
- error = ocfs2_vm_op_block_sigs(&blocked, &oldset);
- if (error < 0) {
- mlog_errno(error);
- ret = VM_FAULT_SIGBUS;
- goto out;
- }
-
+ ocfs2_block_signals(&oldset);
ret = filemap_fault(area, vmf);
+ ocfs2_unblock_signals(&oldset);
- error = ocfs2_vm_op_unblock_sigs(&oldset);
- if (error < 0)
- mlog_errno(error);
-out:
mlog_exit_ptr(vmf->page);
return ret;
}
@@ -159,14 +135,10 @@ static int ocfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
struct page *page = vmf->page;
struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
struct buffer_head *di_bh = NULL;
- sigset_t blocked, oldset;
- int ret, ret2;
+ sigset_t oldset;
+ int ret;
- ret = ocfs2_vm_op_block_sigs(&blocked, &oldset);
- if (ret < 0) {
- mlog_errno(ret);
- return ret;
- }
+ ocfs2_block_signals(&oldset);
/*
* The cluster locks taken will block a truncate from another
@@ -194,9 +166,7 @@ static int ocfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
ocfs2_inode_unlock(inode, 1);
out:
- ret2 = ocfs2_vm_op_unblock_sigs(&oldset);
- if (ret2 < 0)
- mlog_errno(ret2);
+ ocfs2_unblock_signals(&oldset);
if (ret)
ret = VM_FAULT_SIGBUS;
return ret;
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 12c2203a62f..cf6d87b5745 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -2560,5 +2560,25 @@ void __ocfs2_abort(struct super_block* sb,
ocfs2_handle_error(sb);
}
+/*
+ * Void signal blockers, because in-kernel sigprocmask() only fails
+ * when SIG_* is wrong.
+ */
+void ocfs2_block_signals(sigset_t *oldset)
+{
+ int rc;
+ sigset_t blocked;
+
+ sigfillset(&blocked);
+ rc = sigprocmask(SIG_BLOCK, &blocked, oldset);
+ BUG_ON(rc);
+}
+
+void ocfs2_unblock_signals(sigset_t *oldset)
+{
+ int rc = sigprocmask(SIG_SETMASK, oldset, NULL);
+ BUG_ON(rc);
+}
+
module_init(ocfs2_init);
module_exit(ocfs2_exit);
diff --git a/fs/ocfs2/super.h b/fs/ocfs2/super.h
index 783f5270f2a..40c7de084c1 100644
--- a/fs/ocfs2/super.h
+++ b/fs/ocfs2/super.h
@@ -45,4 +45,11 @@ void __ocfs2_abort(struct super_block *sb,
#define ocfs2_abort(sb, fmt, args...) __ocfs2_abort(sb, __PRETTY_FUNCTION__, fmt, ##args)
+/*
+ * Void signal blockers, because in-kernel sigprocmask() only fails
+ * when SIG_* is wrong.
+ */
+void ocfs2_block_signals(sigset_t *oldset);
+void ocfs2_unblock_signals(sigset_t *oldset);
+
#endif /* OCFS2_SUPER_H */