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xfs: Factor out new helper functions xfs_attr_rmtval_set 

Break xfs_attr_rmtval_set into two helper functions
xfs_attr_rmt_find_hole and xfs_attr_rmtval_set_value.
xfs_attr_rmtval_set rolls the transaction between the helpers, but
delayed operations cannot.  We will use the helpers later when
constructing new delayed attribute routines.

Signed-off-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Chandan Rajendra <chandanrlinux@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Allison Collins 2020-07-20 21:47:23 -07:00 committed by Darrick J. Wong
parent deed951287
commit 1a485fc1e9
1 changed files with 92 additions and 57 deletions
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149
fs/xfs/libxfs/xfs_attr_remote.c
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@ -440,32 +440,23 @@ xfs_attr_rmtval_get(
}
/*
* Write the value associated with an attribute into the out-of-line buffer
* that we have defined for it.
* Find a "hole" in the attribute address space large enough for us to drop the
* new attribute's value into
*/
int
xfs_attr_rmtval_set(
STATIC int
xfs_attr_rmt_find_hole(
struct xfs_da_args *args)
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_bmbt_irec map;
xfs_dablk_t lblkno;
xfs_fileoff_t lfileoff = 0;
uint8_t *src = args->value;
int blkcnt;
int valuelen;
int nmap;
int error;
int offset = 0;
trace_xfs_attr_rmtval_set(args);
int blkcnt;
xfs_fileoff_t lfileoff = 0;
/*
* Find a "hole" in the attribute address space large enough for
* us to drop the new attribute's value into. Because CRC enable
* attributes have headers, we can't just do a straight byte to FSB
* conversion and have to take the header space into account.
* Because CRC enable attributes have headers, we can't just do a
* straight byte to FSB conversion and have to take the header space
* into account.
*/
blkcnt = xfs_attr3_rmt_blocks(mp, args->rmtvaluelen);
error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
@ -473,48 +464,26 @@ xfs_attr_rmtval_set(
if (error)
return error;
args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
args->rmtblkno = (xfs_dablk_t)lfileoff;
args->rmtblkcnt = blkcnt;
/*
* Roll through the "value", allocating blocks on disk as required.
*/
while (blkcnt > 0) {
/*
* Allocate a single extent, up to the size of the value.
*
* Note that we have to consider this a data allocation as we
* write the remote attribute without logging the contents.
* Hence we must ensure that we aren't using blocks that are on
* the busy list so that we don't overwrite blocks which have
* recently been freed but their transactions are not yet
* committed to disk. If we overwrite the contents of a busy
* extent and then crash then the block may not contain the
* correct metadata after log recovery occurs.
*/
nmap = 1;
error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
blkcnt, XFS_BMAPI_ATTRFORK, args->total, &map,
&nmap);
if (error)
return error;
error = xfs_defer_finish(&args->trans);
if (error)
return error;
return 0;
}
ASSERT(nmap == 1);
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
(map.br_startblock != HOLESTARTBLOCK));
lblkno += map.br_blockcount;
blkcnt -= map.br_blockcount;
/*
* Start the next trans in the chain.
*/
error = xfs_trans_roll_inode(&args->trans, dp);
if (error)
return error;
}
STATIC int
xfs_attr_rmtval_set_value(
struct xfs_da_args *args)
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_bmbt_irec map;
xfs_dablk_t lblkno;
uint8_t *src = args->value;
int blkcnt;
int valuelen;
int nmap;
int error;
int offset = 0;
/*
* Roll through the "value", copying the attribute value to the
@ -594,6 +563,72 @@ xfs_attr_rmtval_stale(
return 0;
}
/*
* Write the value associated with an attribute into the out-of-line buffer
* that we have defined for it.
*/
int
xfs_attr_rmtval_set(
struct xfs_da_args *args)
{
struct xfs_inode *dp = args->dp;
struct xfs_bmbt_irec map;
xfs_dablk_t lblkno;
int blkcnt;
int nmap;
int error;
trace_xfs_attr_rmtval_set(args);
error = xfs_attr_rmt_find_hole(args);
if (error)
return error;
blkcnt = args->rmtblkcnt;
lblkno = (xfs_dablk_t)args->rmtblkno;
/*
* Roll through the "value", allocating blocks on disk as required.
*/
while (blkcnt > 0) {
/*
* Allocate a single extent, up to the size of the value.
*
* Note that we have to consider this a data allocation as we
* write the remote attribute without logging the contents.
* Hence we must ensure that we aren't using blocks that are on
* the busy list so that we don't overwrite blocks which have
* recently been freed but their transactions are not yet
* committed to disk. If we overwrite the contents of a busy
* extent and then crash then the block may not contain the
* correct metadata after log recovery occurs.
*/
nmap = 1;
error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
blkcnt, XFS_BMAPI_ATTRFORK, args->total, &map,
&nmap);
if (error)
return error;
error = xfs_defer_finish(&args->trans);
if (error)
return error;
ASSERT(nmap == 1);
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
(map.br_startblock != HOLESTARTBLOCK));
lblkno += map.br_blockcount;
blkcnt -= map.br_blockcount;
/*
* Start the next trans in the chain.
*/
error = xfs_trans_roll_inode(&args->trans, dp);
if (error)
return error;
}
return xfs_attr_rmtval_set_value(args);
}
/*
* Remove the value associated with an attribute by deleting the
* out-of-line buffer that it is stored on.