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xfs: Add attibute set and helper functions

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This patch adds xfs_attr_set_args and xfs_bmap_set_attrforkoff.
These sub-routines set the attributes specified in @args.
We will use this later for setting parent pointers as a deferred
attribute operation.

[dgc: remove attr fork init code from xfs_attr_set_args().]
[dgc: xfs_attr_try_sf_addname() NULLs args.trans after commit.]
[dgc: correct sf add error handling.]

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Allison Henderson 2018-10-18 17:21:16 +11:00 committed by Dave Chinner
parent 4c74a56b9d
commit 2f3cd80919
4 changed files with 115 additions and 87 deletions
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151
fs/xfs/libxfs/xfs_attr.c
View File

@ -215,9 +215,80 @@ xfs_attr_try_sf_addname(
xfs_trans_set_sync(args->trans);
error2 = xfs_trans_commit(args->trans);
args->trans = NULL;
return error ? error : error2;
}
/*
* Set the attribute specified in @args.
*/
int
xfs_attr_set_args(
struct xfs_da_args *args,
struct xfs_buf **leaf_bp)
{
struct xfs_inode *dp = args->dp;
int error;
/*
* If the attribute list is non-existent or a shortform list,
* upgrade it to a single-leaf-block attribute list.
*/
if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
dp->i_d.di_anextents == 0)) {
/*
* Build initial attribute list (if required).
*/
if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
xfs_attr_shortform_create(args);
/*
* Try to add the attr to the attribute list in the inode.
*/
error = xfs_attr_try_sf_addname(dp, args);
if (error != -ENOSPC)
return error;
/*
* 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);
if (error)
return error;
/*
* Commit the leaf transformation. We'll need another
* (linked) transaction to add the new attribute to the
* leaf.
*/
error = xfs_trans_roll_inode(&args->trans, dp);
if (error)
return error;
xfs_trans_bjoin(args->trans, *leaf_bp);
*leaf_bp = NULL;
}
if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
error = xfs_attr_leaf_addname(args);
else
error = xfs_attr_node_addname(args);
return error;
}
int
xfs_attr_set(
struct xfs_inode *dp,
@ -282,73 +353,17 @@ xfs_attr_set(
error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
XFS_QMOPT_RES_REGBLKS);
if (error) {
xfs_iunlock(dp, XFS_ILOCK_EXCL);
xfs_trans_cancel(args.trans);
return error;
}
if (error)
goto out_trans_cancel;
xfs_trans_ijoin(args.trans, dp, 0);
/*
* If the attribute list is non-existent or a shortform list,
* upgrade it to a single-leaf-block attribute list.
*/
if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
dp->i_d.di_anextents == 0)) {
/*
* Build initial attribute list (if required).
*/
if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
xfs_attr_shortform_create(&args);
/*
* Try to add the attr to the attribute list in
* the inode.
*/
error = xfs_attr_try_sf_addname(dp, &args);
if (error != -ENOSPC) {
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return error;
}
/*
* 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)
goto out;
/*
* 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);
if (error)
goto out;
/*
* Commit the leaf transformation. We'll need another (linked)
* transaction to add the new attribute to the leaf, which
* means that we have to hold & join the leaf buffer here too.
*/
error = xfs_trans_roll_inode(&args.trans, dp);
if (error)
goto out;
xfs_trans_bjoin(args.trans, leaf_bp);
leaf_bp = NULL;
}
if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
error = xfs_attr_leaf_addname(&args);
else
error = xfs_attr_node_addname(&args);
error = xfs_attr_set_args(&args, &leaf_bp);
if (error)
goto out;
goto out_release_leaf;
if (!args.trans) {
/* shortform attribute has already been committed */
goto out_unlock;
}
/*
* If this is a synchronous mount, make sure that the
@ -365,17 +380,17 @@ xfs_attr_set(
*/
xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
error = xfs_trans_commit(args.trans);
out_unlock:
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return error;
out:
out_release_leaf:
if (leaf_bp)
xfs_trans_brelse(args.trans, leaf_bp);
out_trans_cancel:
if (args.trans)
xfs_trans_cancel(args.trans);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return error;
goto out_unlock;
}
/*

1
fs/xfs/libxfs/xfs_attr.h
View File

@ -140,6 +140,7 @@ int xfs_attr_get(struct xfs_inode *ip, const unsigned char *name,
unsigned char *value, int *valuelenp, int flags);
int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name,
unsigned char *value, int valuelen, int flags);
int xfs_attr_set_args(struct xfs_da_args *args, struct xfs_buf **leaf_bp);
int xfs_attr_remove(struct xfs_inode *dp, const unsigned char *name, int flags);
int xfs_attr_list(struct xfs_inode *dp, char *buffer, int bufsize,
int flags, struct attrlist_cursor_kern *cursor);

49
fs/xfs/libxfs/xfs_bmap.c
View File

@ -1019,6 +1019,34 @@ xfs_bmap_add_attrfork_local(
return -EFSCORRUPTED;
}
/* Set an inode attr fork off based on the format */
int
xfs_bmap_set_attrforkoff(
struct xfs_inode *ip,
int size,
int *version)
{
switch (ip->i_d.di_format) {
case XFS_DINODE_FMT_DEV:
ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
break;
case XFS_DINODE_FMT_LOCAL:
case XFS_DINODE_FMT_EXTENTS:
case XFS_DINODE_FMT_BTREE:
ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
if (!ip->i_d.di_forkoff)
ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
else if ((ip->i_mount->m_flags & XFS_MOUNT_ATTR2) && version)
*version = 2;
break;
default:
ASSERT(0);
return -EINVAL;
}
return 0;
}
/*
* Convert inode from non-attributed to attributed.
* Must not be in a transaction, ip must not be locked.
@ -1070,26 +1098,9 @@ xfs_bmap_add_attrfork(
xfs_trans_ijoin(tp, ip, 0);
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
switch (ip->i_d.di_format) {
case XFS_DINODE_FMT_DEV:
ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
break;
case XFS_DINODE_FMT_LOCAL:
case XFS_DINODE_FMT_EXTENTS:
case XFS_DINODE_FMT_BTREE:
ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
if (!ip->i_d.di_forkoff)
ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
else if (mp->m_flags & XFS_MOUNT_ATTR2)
version = 2;
break;
default:
ASSERT(0);
error = -EINVAL;
error = xfs_bmap_set_attrforkoff(ip, size, &version);
if (error)
goto trans_cancel;
}
ASSERT(ip->i_afp == NULL);
ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
ip->i_afp->if_flags = XFS_IFEXTENTS;

1
fs/xfs/libxfs/xfs_bmap.h
View File

@ -183,6 +183,7 @@ void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
xfs_filblks_t len);
void xfs_trim_extent_eof(struct xfs_bmbt_irec *, struct xfs_inode *);
int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
int xfs_bmap_set_attrforkoff(struct xfs_inode *ip, int size, int *version);
void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork);
void __xfs_bmap_add_free(struct xfs_trans *tp, xfs_fsblock_t bno,
xfs_filblks_t len, struct xfs_owner_info *oinfo,