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SubjectRe: [PATCH 1/2] LSEEK: BTRFS: Avoid i_mutex for SEEK_{CUR,SET,END}
On Wed, Nov 02, 2011 at 04:29:15AM -0400, Christoph Hellwig wrote:
> Andres, can you check with Chris that the btrfs changes made it to
> his tree? The core lseek changes from Andi are in mainline now, but
> I think these bits are better off going through Chrises btrfs tree.

I'm pulling these in, thanks!

-chris

>
> On Sat, Oct 01, 2011 at 10:49:27PM +0200, Andres Freund wrote:
> >
> > Don't need the i_mutex for those cases, only for SEEK_HOLE/DATA.
> >
> > Really-From: Andi Kleen <ak@linux.intel.com>
> > Signed-off-by: Andi Kleen <ak@linux.intel.com>
> > Signed-off-by: Andres Freund <andres@anarazel.de>
> > ---
> > fs/btrfs/file.c | 27 +++++++++++----------------
> > 1 files changed, 11 insertions(+), 16 deletions(-)
> >
> > diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
> > index 7a13337..5bc7116 100644
> > --- a/fs/btrfs/file.c
> > +++ b/fs/btrfs/file.c
> > @@ -1809,24 +1809,19 @@ static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int origin)
> > struct inode *inode = file->f_mapping->host;
> > int ret;
> >
> > + if (origin != SEEK_DATA && origin != SEEK_HOLE)
> > + return generic_file_llseek(file, offset, origin);
> > +
> > mutex_lock(&inode->i_mutex);
> > - switch (origin) {
> > - case SEEK_END:
> > - case SEEK_CUR:
> > - offset = generic_file_llseek(file, offset, origin);
> > - goto out;
> > - case SEEK_DATA:
> > - case SEEK_HOLE:
> > - if (offset >= i_size_read(inode)) {
> > - mutex_unlock(&inode->i_mutex);
> > - return -ENXIO;
> > - }
> > + if (offset >= i_size_read(inode)) {
> > + mutex_unlock(&inode->i_mutex);
> > + return -ENXIO;
> > + }
> >
> > - ret = find_desired_extent(inode, &offset, origin);
> > - if (ret) {
> > - mutex_unlock(&inode->i_mutex);
> > - return ret;
> > - }
> > + ret = find_desired_extent(inode, &offset, origin);
> > + if (ret) {
> > + mutex_unlock(&inode->i_mutex);
> > + return ret;
> > }
> >
> > if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) {
> > --
> > 1.7.6.409.ge7a85.dirty
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> ---end quoted text---


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