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xfs: support bmapping delalloc extents in the CoW fork

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Allow the creation of delayed allocation extents in the CoW fork.  In
a subsequent patch we'll wire up iomap_begin to actually do this via
reflink helper functions.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong
2016-10-03 09:11:32 -07:00
parent 3993baeb3c
commit be51f8119c
4 changed files with 16 additions and 11 deletions
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12
fs/xfs/libxfs/xfs_bmap.c
View File

@@ -2760,6 +2760,7 @@ done:
STATIC void
xfs_bmap_add_extent_hole_delay(
xfs_inode_t *ip, /* incore inode pointer */
int whichfork,
xfs_extnum_t *idx, /* extent number to update/insert */
xfs_bmbt_irec_t *new) /* new data to add to file extents */
{
@@ -2771,8 +2772,10 @@ xfs_bmap_add_extent_hole_delay(
int state; /* state bits, accessed thru macros */
xfs_filblks_t temp=0; /* temp for indirect calculations */
ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
ifp = XFS_IFORK_PTR(ip, whichfork);
state = 0;
if (whichfork == XFS_COW_FORK)
state |= BMAP_COWFORK;
ASSERT(isnullstartblock(new->br_startblock));
/*
@@ -2790,7 +2793,7 @@ xfs_bmap_add_extent_hole_delay(
* Check and set flags if the current (right) segment exists.
* If it doesn't exist, we're converting the hole at end-of-file.
*/
if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
if (*idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
@@ -4154,6 +4157,7 @@ xfs_bmapi_read(
int
xfs_bmapi_reserve_delalloc(
struct xfs_inode *ip,
int whichfork,
xfs_fileoff_t aoff,
xfs_filblks_t len,
struct xfs_bmbt_irec *got,
@@ -4162,7 +4166,7 @@ xfs_bmapi_reserve_delalloc(
int eof)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
xfs_extlen_t alen;
xfs_extlen_t indlen;
char rt = XFS_IS_REALTIME_INODE(ip);
@@ -4221,7 +4225,7 @@ xfs_bmapi_reserve_delalloc(
got->br_startblock = nullstartblock(indlen);
got->br_blockcount = alen;
got->br_state = XFS_EXT_NORM;
xfs_bmap_add_extent_hole_delay(ip, lastx, got);
xfs_bmap_add_extent_hole_delay(ip, whichfork, lastx, got);
/*
* Update our extent pointer, given that xfs_bmap_add_extent_hole_delay

7
fs/xfs/libxfs/xfs_bmap.h
View File

@@ -234,9 +234,10 @@ struct xfs_bmbt_rec_host *
xfs_bmap_search_extents(struct xfs_inode *ip, xfs_fileoff_t bno,
int fork, int *eofp, xfs_extnum_t *lastxp,
struct xfs_bmbt_irec *gotp, struct xfs_bmbt_irec *prevp);
int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, xfs_fileoff_t aoff,
xfs_filblks_t len, struct xfs_bmbt_irec *got,
struct xfs_bmbt_irec *prev, xfs_extnum_t *lastx, int eof);
int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
xfs_fileoff_t aoff, xfs_filblks_t len,
struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *prev,
xfs_extnum_t *lastx, int eof);
enum xfs_bmap_intent_type {
XFS_BMAP_MAP = 1,