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[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>
This commit is contained in:
NeilBrown 2006-06-26 00:27:47 -07:00 committed by Linus Torvalds
parent 0cdd02cabd
commit acc55e2201
2 changed files with 31 additions and 26 deletions
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8
drivers/md/bitmap.c
View File

@ -625,7 +625,6 @@ static void drain_write_queues(struct bitmap *bitmap)
static void bitmap_file_put(struct bitmap *bitmap) static void bitmap_file_put(struct bitmap *bitmap)
{ {
struct file *file; struct file *file;
struct inode *inode;
unsigned long flags; unsigned long flags;
spin_lock_irqsave(&bitmap->lock, flags); spin_lock_irqsave(&bitmap->lock, flags);
@ -637,13 +636,8 @@ static void bitmap_file_put(struct bitmap *bitmap)
bitmap_file_unmap(bitmap); bitmap_file_unmap(bitmap);
if (file) { 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);
fput(file); fput(file);
}
} }

49
drivers/md/md.c
View File

@ -2877,6 +2877,32 @@ out:
return err; 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) static int do_md_stop(mddev_t * mddev, int ro)
{ {
int err = 0; int err = 0;
@ -2940,7 +2966,7 @@ static int do_md_stop(mddev_t * mddev, int ro)
bitmap_destroy(mddev); bitmap_destroy(mddev);
if (mddev->bitmap_file) { 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); fput(mddev->bitmap_file);
mddev->bitmap_file = NULL; mddev->bitmap_file = NULL;
} }
@ -3544,23 +3570,6 @@ abort_export:
return err; 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) static int set_bitmap_file(mddev_t *mddev, int fd)
{ {
int err; int err;
@ -3608,8 +3617,10 @@ static int set_bitmap_file(mddev_t *mddev, int fd)
mddev->pers->quiesce(mddev, 0); mddev->pers->quiesce(mddev, 0);
} }
if (fd < 0) { if (fd < 0) {
if (mddev->bitmap_file) if (mddev->bitmap_file) {
restore_bitmap_write_access(mddev->bitmap_file);
fput(mddev->bitmap_file); fput(mddev->bitmap_file);
}
mddev->bitmap_file = NULL; mddev->bitmap_file = NULL;
} }