On Tue, Apr 07, 2015 at 05:35:44PM +0200, Christoph Hellwig wrote:
> We want to drop all I/O path locks when recalling layouts, and that includes
> i_mutex for the write path. Without this we get stuck processe when recalls
> take too long.
Also if the writer is an nfsd thread than we'd rather just error out
than wait.
--b.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
> fs/xfs/xfs_file.c | 4 ++--
> fs/xfs/xfs_ioctl.c | 2 +-
> fs/xfs/xfs_iops.c | 2 +-
> fs/xfs/xfs_pnfs.c | 7 ++++++-
> fs/xfs/xfs_pnfs.h | 2 +-
> 5 files changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index a2e1cb8..963dfb2 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -559,7 +559,7 @@ restart:
> if (error)
> return error;
>
> - error = xfs_break_layouts(inode, iolock);
> + error = xfs_break_layouts(inode, iolock, true);
> if (error)
> return error;
>
> @@ -843,7 +843,7 @@ xfs_file_fallocate(
> return -EOPNOTSUPP;
>
> xfs_ilock(ip, iolock);
> - error = xfs_break_layouts(inode, &iolock);
> + error = xfs_break_layouts(inode, &iolock, false);
> if (error)
> goto out_unlock;
>
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index ac4feae..3a21cc7 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -639,7 +639,7 @@ xfs_ioc_space(
> return error;
>
> xfs_ilock(ip, iolock);
> - error = xfs_break_layouts(inode, &iolock);
> + error = xfs_break_layouts(inode, &iolock, false);
> if (error)
> goto out_unlock;
>
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index e53a903..79520c7 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -975,7 +975,7 @@ xfs_vn_setattr(
> uint iolock = XFS_IOLOCK_EXCL;
>
> xfs_ilock(ip, iolock);
> - error = xfs_break_layouts(dentry->d_inode, &iolock);
> + error = xfs_break_layouts(dentry->d_inode, &iolock, true);
> if (!error)
> error = xfs_setattr_size(ip, iattr);
> xfs_iunlock(ip, iolock);
> diff --git a/fs/xfs/xfs_pnfs.c b/fs/xfs/xfs_pnfs.c
> index 365dd57..981a657 100644
> --- a/fs/xfs/xfs_pnfs.c
> +++ b/fs/xfs/xfs_pnfs.c
> @@ -31,7 +31,8 @@
> int
> xfs_break_layouts(
> struct inode *inode,
> - uint *iolock)
> + uint *iolock,
> + bool with_imutex)
> {
> struct xfs_inode *ip = XFS_I(inode);
> int error;
> @@ -40,8 +41,12 @@ xfs_break_layouts(
>
> while ((error = break_layout(inode, false) == -EWOULDBLOCK)) {
> xfs_iunlock(ip, *iolock);
> + if (with_imutex && (*iolock & XFS_IOLOCK_EXCL))
> + mutex_unlock(&inode->i_mutex);
> error = break_layout(inode, true);
> *iolock = XFS_IOLOCK_EXCL;
> + if (with_imutex)
> + mutex_lock(&inode->i_mutex);
> xfs_ilock(ip, *iolock);
> }
>
> diff --git a/fs/xfs/xfs_pnfs.h b/fs/xfs/xfs_pnfs.h
> index b7fbfce..f749475 100644
> --- a/fs/xfs/xfs_pnfs.h
> +++ b/fs/xfs/xfs_pnfs.h
> @@ -8,7 +8,7 @@ int xfs_fs_map_blocks(struct inode *inode, loff_t offset, u64 length,
> int xfs_fs_commit_blocks(struct inode *inode, struct iomap *maps, int nr_maps,
> struct iattr *iattr);
>
> -int xfs_break_layouts(struct inode *inode, uint *iolock);
> +int xfs_break_layouts(struct inode *inode, uint *iolock, bool with_imutex);
> #else
> static inline int xfs_break_layouts(struct inode *inode, uint *iolock)
> {
> --
> 1.9.1
>
> --
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