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fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlers

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Btrfs needs to be able to control how filemap_write_and_wait_range() is called
in fsync to make it less of a painful operation, so push down taking i_mutex and
the calling of filemap_write_and_wait() down into the ->fsync() handlers.  Some
file systems can drop taking the i_mutex altogether it seems, like ext3 and
ocfs2.  For correctness sake I just pushed everything down in all cases to make
sure that we keep the current behavior the same for everybody, and then each
individual fs maintainer can make up their mind about what to do from there.
Thanks,

Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Josef Bacik 2011-07-16 20:44:56 -04:00 • committed by Al Viro
parent 22735068d5
commit 02c24a8218
71 changed files with 462 additions and 164 deletions
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25
fs/sync.c
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@ -165,28 +165,9 @@ SYSCALL_DEFINE1(syncfs, int, fd)
*/
int vfs_fsync_range(struct file *file, loff_t start, loff_t end, int datasync)
{
struct address_space *mapping = file->f_mapping;
int err, ret;
if (!file->f_op || !file->f_op->fsync) {
ret = -EINVAL;
goto out;
}
ret = filemap_write_and_wait_range(mapping, start, end);
/*
* We need to protect against concurrent writers, which could cause
* livelocks in fsync_buffers_list().
*/
mutex_lock(&mapping->host->i_mutex);
err = file->f_op->fsync(file, datasync);
if (!ret)
ret = err;
mutex_unlock(&mapping->host->i_mutex);
out:
return ret;
if (!file->f_op || !file->f_op->fsync)
return -EINVAL;
return file->f_op->fsync(file, start, end, datasync);
}
EXPORT_SYMBOL(vfs_fsync_range);