Re: [PATCH v16 04/11] xfs: Add helper xfs_attr_set_fmt
From: Chandan Babu R <hidden>
Date: 2021-03-29 09:38:12
On 26 Mar 2021 at 06:03, Allison Henderson wrote:
This patch adds a helper function xfs_attr_set_fmt. This will help isolate the code that will require state management from the portions that do not. xfs_attr_set_fmt returns 0 when the attr has been set and no further action is needed. It returns -EAGAIN when shortform has been transformed to leaf, and the calling function should proceed the set the attr in leaf form.
The previous behaviour is maintained across the changes made by this patch. Reviewed-by: Chandan Babu R <redacted>
quoted hunk ↗ jump to hunk
Signed-off-by: Allison Henderson <redacted> Reviewed-by: Brian Foster <redacted> --- fs/xfs/libxfs/xfs_attr.c | 79 ++++++++++++++++++++++++++++-------------------- 1 file changed, 46 insertions(+), 33 deletions(-)diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c index 5216f67..d46324a 100644 --- a/fs/xfs/libxfs/xfs_attr.c +++ b/fs/xfs/libxfs/xfs_attr.c@@ -216,6 +216,48 @@ xfs_attr_is_shortform( ip->i_afp->if_nextents == 0); } +STATIC int +xfs_attr_set_fmt( + struct xfs_da_args *args) +{ + struct xfs_buf *leaf_bp = NULL; + struct xfs_inode *dp = args->dp; + int error2, error = 0; + + /* + * Try to add the attr to the attribute list in the inode. + */ + error = xfs_attr_try_sf_addname(dp, args); + if (error != -ENOSPC) { + error2 = xfs_trans_commit(args->trans); + args->trans = NULL; + return error ? error : error2; + } + + /* + * It won't fit in the shortform, transform to a leaf block. + * GROT: another possible req'mt for a double-split btree op. + */ + error = xfs_attr_shortform_to_leaf(args, &leaf_bp); + if (error) + return error; + + /* + * Prevent the leaf buffer from being unlocked so that a + * concurrent AIL push cannot grab the half-baked leaf buffer + * and run into problems with the write verifier. + */ + xfs_trans_bhold(args->trans, leaf_bp); + error = xfs_defer_finish(&args->trans); + xfs_trans_bhold_release(args->trans, leaf_bp); + if (error) { + xfs_trans_brelse(args->trans, leaf_bp); + return error; + } + + return -EAGAIN; +} + /* * Set the attribute specified in @args. */@@ -224,8 +266,7 @@ xfs_attr_set_args( struct xfs_da_args *args) { struct xfs_inode *dp = args->dp; - struct xfs_buf *leaf_bp = NULL; - int error2, error = 0; + int error; /* * If the attribute list is already in leaf format, jump straight to@@ -234,36 +275,9 @@ xfs_attr_set_args( * again. */ if (xfs_attr_is_shortform(dp)) { - /* - * Try to add the attr to the attribute list in the inode. - */ - error = xfs_attr_try_sf_addname(dp, args); - if (error != -ENOSPC) { - error2 = xfs_trans_commit(args->trans); - args->trans = NULL; - return error ? error : error2; - } - - /* - * It won't fit in the shortform, transform to a leaf block. - * GROT: another possible req'mt for a double-split btree op. - */ - error = xfs_attr_shortform_to_leaf(args, &leaf_bp); - if (error) - return error; - - /* - * Prevent the leaf buffer from being unlocked so that a - * concurrent AIL push cannot grab the half-baked leaf buffer - * and run into problems with the write verifier. - */ - xfs_trans_bhold(args->trans, leaf_bp); - error = xfs_defer_finish(&args->trans); - xfs_trans_bhold_release(args->trans, leaf_bp); - if (error) { - xfs_trans_brelse(args->trans, leaf_bp); + error = xfs_attr_set_fmt(args); + if (error != -EAGAIN) return error; - } } if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {@@ -297,8 +311,7 @@ xfs_attr_set_args( return error; } - error = xfs_attr_node_addname(args); - return error; + return xfs_attr_node_addname(args); } /*
-- chandan