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authorNeilBrown <neilb@suse.de>2006-06-26 00:27:47 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:38 -0700
commitacc55e220166a5ad898e66ad6153fd62eaaac76d (patch)
treec342dcd3303f01d97c5fe7718af9daf22ec086d2 /drivers
parent0cdd02cabd86b5d547f882005e23a93929f0ace9 (diff)
downloadop-kernel-dev-acc55e220166a5ad898e66ad6153fd62eaaac76d.zip
op-kernel-dev-acc55e220166a5ad898e66ad6153fd62eaaac76d.tar.gz
[PATCH] md/bitmap: tidy up i_writecount handling in md/bitmap
md/bitmap modifies i_writecount of a bitmap file to make sure that no-one else writes to it. The reverting of the change is sometimes done twice, and there is one error path where it is omitted. This patch tidies that up. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/bitmap.c8
-rw-r--r--drivers/md/md.c49
2 files changed, 31 insertions, 26 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index dfe5e127..e40d3e4 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -625,7 +625,6 @@ static void drain_write_queues(struct bitmap *bitmap)
static void bitmap_file_put(struct bitmap *bitmap)
{
struct file *file;
- struct inode *inode;
unsigned long flags;
spin_lock_irqsave(&bitmap->lock, flags);
@@ -637,13 +636,8 @@ static void bitmap_file_put(struct bitmap *bitmap)
bitmap_file_unmap(bitmap);
- if (file) {
- inode = file->f_mapping->host;
- spin_lock(&inode->i_lock);
- atomic_set(&inode->i_writecount, 1); /* allow writes again */
- spin_unlock(&inode->i_lock);
+ if (file)
fput(file);
- }
}
diff --git a/drivers/md/md.c b/drivers/md/md.c
index ea6837d..7da9e2d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2877,6 +2877,32 @@ out:
return err;
}
+/* similar to deny_write_access, but accounts for our holding a reference
+ * to the file ourselves */
+static int deny_bitmap_write_access(struct file * file)
+{
+ struct inode *inode = file->f_mapping->host;
+
+ spin_lock(&inode->i_lock);
+ if (atomic_read(&inode->i_writecount) > 1) {
+ spin_unlock(&inode->i_lock);
+ return -ETXTBSY;
+ }
+ atomic_set(&inode->i_writecount, -1);
+ spin_unlock(&inode->i_lock);
+
+ return 0;
+}
+
+static void restore_bitmap_write_access(struct file *file)
+{
+ struct inode *inode = file->f_mapping->host;
+
+ spin_lock(&inode->i_lock);
+ atomic_set(&inode->i_writecount, 1);
+ spin_unlock(&inode->i_lock);
+}
+
static int do_md_stop(mddev_t * mddev, int ro)
{
int err = 0;
@@ -2940,7 +2966,7 @@ static int do_md_stop(mddev_t * mddev, int ro)
bitmap_destroy(mddev);
if (mddev->bitmap_file) {
- atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
+ restore_bitmap_write_access(mddev->bitmap_file);
fput(mddev->bitmap_file);
mddev->bitmap_file = NULL;
}
@@ -3544,23 +3570,6 @@ abort_export:
return err;
}
-/* similar to deny_write_access, but accounts for our holding a reference
- * to the file ourselves */
-static int deny_bitmap_write_access(struct file * file)
-{
- struct inode *inode = file->f_mapping->host;
-
- spin_lock(&inode->i_lock);
- if (atomic_read(&inode->i_writecount) > 1) {
- spin_unlock(&inode->i_lock);
- return -ETXTBSY;
- }
- atomic_set(&inode->i_writecount, -1);
- spin_unlock(&inode->i_lock);
-
- return 0;
-}
-
static int set_bitmap_file(mddev_t *mddev, int fd)
{
int err;
@@ -3608,8 +3617,10 @@ static int set_bitmap_file(mddev_t *mddev, int fd)
mddev->pers->quiesce(mddev, 0);
}
if (fd < 0) {
- if (mddev->bitmap_file)
+ if (mddev->bitmap_file) {
+ restore_bitmap_write_access(mddev->bitmap_file);
fput(mddev->bitmap_file);
+ }
mddev->bitmap_file = NULL;
}
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