diff options
| author | NeilBrown <neilb@suse.de> | 2006-06-26 00:27:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 09:58:38 -0700 |
| commit | acc55e220166a5ad898e66ad6153fd62eaaac76d (patch) | |
| tree | c342dcd3303f01d97c5fe7718af9daf22ec086d2 /drivers/md | |
| parent | 0cdd02cabd86b5d547f882005e23a93929f0ace9 (diff) | |
| download | linux-acc55e220166a5ad898e66ad6153fd62eaaac76d.tar.bz2 | |
[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/md')
| -rw-r--r-- | drivers/md/bitmap.c | 8 | ||||
| -rw-r--r-- | drivers/md/md.c | 49 |
2 files changed, 31 insertions, 26 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index dfe5e12741ba..e40d3e4b8d27 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 ea6837d45fc8..7da9e2d023bb 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; } |