From: Allison Collins <allison.henderson@oracle.com>
To: Brian Foster <bfoster@redhat.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH v8 01/20] xfs: Add xfs_has_attr and subroutines
Date: Mon, 6 Apr 2020 15:09:51 -0700 [thread overview]
Message-ID: <42a5f0aa-3a50-543e-bfae-79873cfc87e5@oracle.com> (raw)
In-Reply-To: <20200406143117.GC20708@bfoster>
On 4/6/20 7:31 AM, Brian Foster wrote:
> On Fri, Apr 03, 2020 at 03:12:10PM -0700, Allison Collins wrote:
>> This patch adds a new functions to check for the existence of an
>> attribute. Subroutines are also added to handle the cases of leaf
>> blocks, nodes or shortform. Common code that appears in existing attr
>> add and remove functions have been factored out to help reduce the
>> appearance of duplicated code. We will need these routines later for
>> delayed attributes since delayed operations cannot return error codes.
>>
>> Signed-off-by: Allison Collins <allison.henderson@oracle.com>
>> Reviewed-by: Chandan Rajendra <chandanrlinux@gmail.com>
>> ---
>> fs/xfs/libxfs/xfs_attr.c | 181 ++++++++++++++++++++++++++++--------------
>> fs/xfs/libxfs/xfs_attr.h | 1 +
>> fs/xfs/libxfs/xfs_attr_leaf.c | 97 +++++++++++++++-------
>> fs/xfs/libxfs/xfs_attr_leaf.h | 3 +
>> 4 files changed, 191 insertions(+), 91 deletions(-)
>>
>> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
>> index e4fe3dc..2a0d3d3 100644
>> --- a/fs/xfs/libxfs/xfs_attr.c
>> +++ b/fs/xfs/libxfs/xfs_attr.c
> ...
>> @@ -703,21 +749,57 @@ xfs_attr_leaf_get(xfs_da_args_t *args)
>>
>> trace_xfs_attr_leaf_get(args);
>>
>> - args->blkno = 0;
>> - error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, &bp);
>> - if (error)
>> - return error;
>> + error = xfs_attr_leaf_hasname(args, &bp);
>>
>> - error = xfs_attr3_leaf_lookup_int(bp, args);
>> if (error != -EEXIST) {
>> xfs_trans_brelse(args->trans, bp);
>> return error;
>> - }
>> + } else if (error != -EEXIST)
>> + return error;
>> +
>
> The if/else above looks busted (the same check for both branches).
Sorry, that one should have been ENOATTR for this branch. Will fix.
>
>> +
>> error = xfs_attr3_leaf_getvalue(bp, args);
>> xfs_trans_brelse(args->trans, bp);
>> return error;
>> }
>>
>> +/*
>> + * Return EEXIST if attr is found, or ENOATTR if not
>> + * statep: If not null is set to point at the found state. Caller will
>> + * be responsible for freeing the state in this case.
>> + */
>> +STATIC int
>> +xfs_attr_node_hasname(
>> + struct xfs_da_args *args,
>> + struct xfs_da_state **statep)
>> +{
>> + struct xfs_da_state *state;
>> + int retval, error;
>> +
>> + state = xfs_da_state_alloc();
>> + state->args = args;
>> + state->mp = args->dp->i_mount;
>> +
>> + if (statep != NULL)
>> + *statep = NULL;
>> +
>> + /*
>> + * Search to see if name exists, and get back a pointer to it.
>> + */
>> + error = xfs_da3_node_lookup_int(state, &retval);
>> + if (error == 0) {
>> + if (statep != NULL)
>> + *statep = state;
>> + else
>> + xfs_da_state_free(state);
>> + return retval;
>> + }
>> +
>> + xfs_da_state_free(state);
>> +
>
> Inverting the logic is a bit more clear IMO:
>
> ...
> error = xfs_da3_node_lookup_int(state, &retval);
> if (error) {
> ...
> return error;
> }
>
> if (statep)
> ...
> else
> ...
> return retval;
> }
>
Sure, will flip. Thanks for the reviews!
Allison
> With those things addressed:
>
> Reviewed-by: Brian Foster <bfoster@redhat.com>
>
>> + return error;
>> +}
>> +
>> /*========================================================================
>> * External routines when attribute list size > geo->blksize
>> *========================================================================*/
>> @@ -750,17 +832,14 @@ xfs_attr_node_addname(
>> dp = args->dp;
>> mp = dp->i_mount;
>> restart:
>> - state = xfs_da_state_alloc();
>> - state->args = args;
>> - state->mp = mp;
>> -
>> /*
>> * Search to see if name already exists, and get back a pointer
>> * to where it should go.
>> */
>> - error = xfs_da3_node_lookup_int(state, &retval);
>> - if (error)
>> + retval = xfs_attr_node_hasname(args, &state);
>> + if (retval != -ENOATTR && retval != -EEXIST)
>> goto out;
>> +
>> blk = &state->path.blk[ state->path.active-1 ];
>> ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
>> if (retval == -ENOATTR && (args->attr_flags & XATTR_REPLACE))
>> @@ -965,29 +1044,15 @@ xfs_attr_node_removename(
>> {
>> struct xfs_da_state *state;
>> struct xfs_da_state_blk *blk;
>> - struct xfs_inode *dp;
>> struct xfs_buf *bp;
>> int retval, error, forkoff;
>> + struct xfs_inode *dp = args->dp;
>>
>> trace_xfs_attr_node_removename(args);
>>
>> - /*
>> - * Tie a string around our finger to remind us where we are.
>> - */
>> - dp = args->dp;
>> - state = xfs_da_state_alloc();
>> - state->args = args;
>> - state->mp = dp->i_mount;
>> -
>> - /*
>> - * Search to see if name exists, and get back a pointer to it.
>> - */
>> - error = xfs_da3_node_lookup_int(state, &retval);
>> - if (error || (retval != -EEXIST)) {
>> - if (error == 0)
>> - error = retval;
>> + error = xfs_attr_node_hasname(args, &state);
>> + if (error != -EEXIST)
>> goto out;
>> - }
>>
>> /*
>> * If there is an out-of-line value, de-allocate the blocks.
>> @@ -1082,7 +1147,8 @@ xfs_attr_node_removename(
>> error = 0;
>>
>> out:
>> - xfs_da_state_free(state);
>> + if (state)
>> + xfs_da_state_free(state);
>> return error;
>> }
>>
>> @@ -1202,31 +1268,23 @@ xfs_attr_node_get(xfs_da_args_t *args)
>> {
>> xfs_da_state_t *state;
>> xfs_da_state_blk_t *blk;
>> - int error, retval;
>> + int error;
>> int i;
>>
>> trace_xfs_attr_node_get(args);
>>
>> - state = xfs_da_state_alloc();
>> - state->args = args;
>> - state->mp = args->dp->i_mount;
>> -
>> /*
>> * Search to see if name exists, and get back a pointer to it.
>> */
>> - error = xfs_da3_node_lookup_int(state, &retval);
>> - if (error) {
>> - retval = error;
>> - goto out_release;
>> - }
>> - if (retval != -EEXIST)
>> + error = xfs_attr_node_hasname(args, &state);
>> + if (error != -EEXIST)
>> goto out_release;
>>
>> /*
>> * Get the value, local or "remote"
>> */
>> blk = &state->path.blk[state->path.active - 1];
>> - retval = xfs_attr3_leaf_getvalue(blk->bp, args);
>> + error = xfs_attr3_leaf_getvalue(blk->bp, args);
>>
>> /*
>> * If not in a transaction, we have to release all the buffers.
>> @@ -1237,8 +1295,9 @@ xfs_attr_node_get(xfs_da_args_t *args)
>> state->path.blk[i].bp = NULL;
>> }
>>
>> - xfs_da_state_free(state);
>> - return retval;
>> + if (state)
>> + xfs_da_state_free(state);
>> + return error;
>> }
>>
>> /* Returns true if the attribute entry name is valid. */
>> diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
>> index 0d2d059..66575b8 100644
>> --- a/fs/xfs/libxfs/xfs_attr.h
>> +++ b/fs/xfs/libxfs/xfs_attr.h
>> @@ -89,6 +89,7 @@ int xfs_attr_get_ilocked(struct xfs_da_args *args);
>> int xfs_attr_get(struct xfs_da_args *args);
>> int xfs_attr_set(struct xfs_da_args *args);
>> int xfs_attr_set_args(struct xfs_da_args *args);
>> +int xfs_has_attr(struct xfs_da_args *args);
>> int xfs_attr_remove_args(struct xfs_da_args *args);
>> bool xfs_attr_namecheck(const void *name, size_t length);
>>
>> diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
>> index 863444e..9f39e7a 100644
>> --- a/fs/xfs/libxfs/xfs_attr_leaf.c
>> +++ b/fs/xfs/libxfs/xfs_attr_leaf.c
>> @@ -664,18 +664,63 @@ xfs_attr_shortform_create(xfs_da_args_t *args)
>> }
>>
>> /*
>> + * Return -EEXIST if attr is found, or -ENOATTR if not
>> + * args: args containing attribute name and namelen
>> + * sfep: If not null, pointer will be set to the last attr entry found on
>> + -EEXIST. On -ENOATTR pointer is left at the last entry in the list
>> + * basep: If not null, pointer is set to the byte offset of the entry in the
>> + * list on -EEXIST. On -ENOATTR, pointer is left at the byte offset of
>> + * the last entry in the list
>> + */
>> +int
>> +xfs_attr_sf_findname(
>> + struct xfs_da_args *args,
>> + struct xfs_attr_sf_entry **sfep,
>> + unsigned int *basep)
>> +{
>> + struct xfs_attr_shortform *sf;
>> + struct xfs_attr_sf_entry *sfe;
>> + unsigned int base = sizeof(struct xfs_attr_sf_hdr);
>> + int size = 0;
>> + int end;
>> + int i;
>> +
>> + sf = (struct xfs_attr_shortform *)args->dp->i_afp->if_u1.if_data;
>> + sfe = &sf->list[0];
>> + end = sf->hdr.count;
>> + for (i = 0; i < end; sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
>> + base += size, i++) {
>> + size = XFS_ATTR_SF_ENTSIZE(sfe);
>> + if (!xfs_attr_match(args, sfe->namelen, sfe->nameval,
>> + sfe->flags))
>> + continue;
>> + break;
>> + }
>> +
>> + if (sfep != NULL)
>> + *sfep = sfe;
>> +
>> + if (basep != NULL)
>> + *basep = base;
>> +
>> + if (i == end)
>> + return -ENOATTR;
>> + return -EEXIST;
>> +}
>> +
>> +/*
>> * Add a name/value pair to the shortform attribute list.
>> * Overflow from the inode has already been checked for.
>> */
>> void
>> -xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff)
>> +xfs_attr_shortform_add(struct xfs_da_args *args, int forkoff)
>> {
>> - xfs_attr_shortform_t *sf;
>> - xfs_attr_sf_entry_t *sfe;
>> - int i, offset, size;
>> - xfs_mount_t *mp;
>> - xfs_inode_t *dp;
>> - struct xfs_ifork *ifp;
>> + struct xfs_attr_shortform *sf;
>> + struct xfs_attr_sf_entry *sfe;
>> + int offset, size, error;
>> + struct xfs_mount *mp;
>> + struct xfs_inode *dp;
>> + struct xfs_ifork *ifp;
>>
>> trace_xfs_attr_sf_add(args);
>>
>> @@ -686,11 +731,8 @@ xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff)
>> ifp = dp->i_afp;
>> ASSERT(ifp->if_flags & XFS_IFINLINE);
>> sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
>> - sfe = &sf->list[0];
>> - for (i = 0; i < sf->hdr.count; sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
>> - ASSERT(!xfs_attr_match(args, sfe->namelen, sfe->nameval,
>> - sfe->flags));
>> - }
>> + error = xfs_attr_sf_findname(args, &sfe, NULL);
>> + ASSERT(error != -EEXIST);
>>
>> offset = (char *)sfe - (char *)sf;
>> size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
>> @@ -733,31 +775,26 @@ xfs_attr_fork_remove(
>> * Remove an attribute from the shortform attribute list structure.
>> */
>> int
>> -xfs_attr_shortform_remove(xfs_da_args_t *args)
>> +xfs_attr_shortform_remove(struct xfs_da_args *args)
>> {
>> - xfs_attr_shortform_t *sf;
>> - xfs_attr_sf_entry_t *sfe;
>> - int base, size=0, end, totsize, i;
>> - xfs_mount_t *mp;
>> - xfs_inode_t *dp;
>> + struct xfs_attr_shortform *sf;
>> + struct xfs_attr_sf_entry *sfe;
>> + int size = 0, end, totsize;
>> + unsigned int base;
>> + struct xfs_mount *mp;
>> + struct xfs_inode *dp;
>> + int error;
>>
>> trace_xfs_attr_sf_remove(args);
>>
>> dp = args->dp;
>> mp = dp->i_mount;
>> - base = sizeof(xfs_attr_sf_hdr_t);
>> sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
>> - sfe = &sf->list[0];
>> - end = sf->hdr.count;
>> - for (i = 0; i < end; sfe = XFS_ATTR_SF_NEXTENTRY(sfe),
>> - base += size, i++) {
>> - size = XFS_ATTR_SF_ENTSIZE(sfe);
>> - if (xfs_attr_match(args, sfe->namelen, sfe->nameval,
>> - sfe->flags))
>> - break;
>> - }
>> - if (i == end)
>> - return -ENOATTR;
>> +
>> + error = xfs_attr_sf_findname(args, &sfe, &base);
>> + if (error != -EEXIST)
>> + return error;
>> + size = XFS_ATTR_SF_ENTSIZE(sfe);
>>
>> /*
>> * Fix up the attribute fork data, covering the hole
>> diff --git a/fs/xfs/libxfs/xfs_attr_leaf.h b/fs/xfs/libxfs/xfs_attr_leaf.h
>> index 6dd2d93..88ec042 100644
>> --- a/fs/xfs/libxfs/xfs_attr_leaf.h
>> +++ b/fs/xfs/libxfs/xfs_attr_leaf.h
>> @@ -52,6 +52,9 @@ int xfs_attr_shortform_getvalue(struct xfs_da_args *args);
>> int xfs_attr_shortform_to_leaf(struct xfs_da_args *args,
>> struct xfs_buf **leaf_bp);
>> int xfs_attr_shortform_remove(struct xfs_da_args *args);
>> +int xfs_attr_sf_findname(struct xfs_da_args *args,
>> + struct xfs_attr_sf_entry **sfep,
>> + unsigned int *basep);
>> int xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp);
>> int xfs_attr_shortform_bytesfit(struct xfs_inode *dp, int bytes);
>> xfs_failaddr_t xfs_attr_shortform_verify(struct xfs_inode *ip);
>> --
>> 2.7.4
>>
>
next prev parent reply other threads:[~2020-04-06 22:09 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-03 22:12 [PATCH v8 00/20] xfs: Delay Ready Attributes Allison Collins
2020-04-03 22:12 ` [PATCH v8 01/20] xfs: Add xfs_has_attr and subroutines Allison Collins
2020-04-06 14:31 ` Brian Foster
2020-04-06 22:09 ` Allison Collins [this message]
2020-04-03 22:12 ` [PATCH v8 02/20] xfs: Check for -ENOATTR or -EEXIST Allison Collins
2020-04-06 14:31 ` Brian Foster
2020-04-06 23:14 ` Allison Collins
2020-04-15 6:43 ` Chandan Rajendra
2020-04-03 22:12 ` [PATCH v8 03/20] xfs: Factor out new helper functions xfs_attr_rmtval_set Allison Collins
2020-04-03 22:12 ` [PATCH v8 04/20] xfs: Pull up trans handling in xfs_attr3_leaf_flipflags Allison Collins
2020-04-03 22:12 ` [PATCH v8 05/20] xfs: Split apart xfs_attr_leaf_addname Allison Collins
2020-04-03 22:12 ` [PATCH v8 06/20] xfs: Refactor xfs_attr_try_sf_addname Allison Collins
2020-04-03 22:12 ` [PATCH v8 07/20] xfs: Pull up trans roll from xfs_attr3_leaf_setflag Allison Collins
2020-04-03 22:12 ` [PATCH v8 08/20] xfs: Factor out xfs_attr_rmtval_invalidate Allison Collins
2020-04-03 22:12 ` [PATCH v8 09/20] xfs: Pull up trans roll in xfs_attr3_leaf_clearflag Allison Collins
2020-04-03 22:12 ` [PATCH v8 10/20] xfs: Add helper function __xfs_attr_rmtval_remove Allison Collins
2020-04-07 14:16 ` Brian Foster
2020-04-07 22:19 ` Allison Collins
2020-04-29 23:05 ` Darrick J. Wong
2020-04-29 23:09 ` Darrick J. Wong
2020-04-03 22:12 ` [PATCH v8 11/20] xfs: Add helper function xfs_attr_node_shrink Allison Collins
2020-04-07 14:17 ` Brian Foster
2020-04-07 21:52 ` Allison Collins
2020-04-15 10:16 ` Chandan Rajendra
2020-04-15 22:13 ` Allison Collins
2020-04-03 22:12 ` [PATCH v8 12/20] xfs: Removed unneeded xfs_trans_roll_inode calls Allison Collins
2020-04-07 14:17 ` Brian Foster
2020-04-07 21:53 ` Allison Collins
2020-04-03 22:12 ` [PATCH v8 13/20] xfs: Add helpers xfs_attr_is_shortform and xfs_attr_set_shortform Allison Collins
2020-04-07 15:23 ` Brian Foster
2020-04-07 21:53 ` Allison Collins
2020-04-10 16:55 ` Allison Collins
2020-04-11 12:57 ` Brian Foster
2020-04-20 5:30 ` Chandan Rajendra
2020-04-20 22:45 ` Allison Collins
2020-04-03 22:12 ` [PATCH v8 14/20] xfs: Add helper function xfs_attr_leaf_mark_incomplete Allison Collins
2020-04-07 15:23 ` Brian Foster
2020-04-07 21:53 ` Allison Collins
2020-04-03 22:12 ` [PATCH v8 15/20] xfs: Add remote block helper functions Allison Collins
2020-04-08 12:09 ` Brian Foster
2020-04-08 16:32 ` Allison Collins
2020-04-03 22:12 ` [PATCH v8 16/20] xfs: Add helper function xfs_attr_node_removename_setup Allison Collins
2020-04-08 12:09 ` Brian Foster
2020-04-08 16:32 ` Allison Collins
2020-04-20 6:25 ` Chandan Rajendra
2020-04-20 22:46 ` Allison Collins
2020-04-03 22:12 ` [PATCH v8 17/20] xfs: Add helper function xfs_attr_node_removename_rmt Allison Collins
2020-04-08 12:10 ` Brian Foster
2020-04-08 16:32 ` Allison Collins
2020-04-20 6:38 ` Chandan Rajendra
2020-04-20 22:46 ` Allison Collins
2020-04-03 22:12 ` [PATCH v8 18/20] xfs: Add delay ready attr remove routines Allison Collins
2020-04-13 12:30 ` Brian Foster
2020-04-14 21:35 ` Allison Collins
2020-04-15 11:46 ` Brian Foster
2020-04-16 3:17 ` Allison Collins
2020-04-16 10:58 ` Brian Foster
2020-04-16 22:41 ` Allison Collins
2020-04-20 9:06 ` Chandan Rajendra
2020-04-20 23:26 ` Allison Collins
2020-04-03 22:12 ` [PATCH v8 19/20] xfs: Add delay ready attr set routines Allison Collins
2020-04-13 13:40 ` Brian Foster
2020-04-15 22:08 ` Allison Collins
2020-04-16 11:01 ` Brian Foster
2020-04-16 22:54 ` Allison Collins
2020-04-17 10:36 ` Brian Foster
2020-04-20 11:45 ` Chandan Rajendra
2020-04-20 16:20 ` Brian Foster
2020-04-20 23:26 ` Allison Collins
2020-04-03 22:12 ` [PATCH v8 20/20] xfs: Rename __xfs_attr_rmtval_remove Allison Collins
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