Allow the creation of delayed allocation extents in the CoW fork.
In a subsequent patch we'll wire up write_begin and page_mkwrite to
actually do this.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
libxfs/xfs_bmap.c | 29 ++++++++++++++++++-----------
libxfs/xfs_bmap.h | 2 +-
2 files changed, 19 insertions(+), 12 deletions(-)
diff --git a/libxfs/xfs_bmap.c b/libxfs/xfs_bmap.c
index 3121f7f..cdc1ed3 100644
--- a/libxfs/xfs_bmap.c
+++ b/libxfs/xfs_bmap.c
@@ -2752,6 +2752,7 @@ 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 */
{
@@ -2763,8 +2764,10 @@ 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));
/*
@@ -2782,7 +2785,7 @@ 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);
@@ -4133,6 +4136,7 @@ xfs_bmapi_read(
STATIC int
xfs_bmapi_reserve_delalloc(
struct xfs_inode *ip,
+ int whichfork,
xfs_fileoff_t aoff,
xfs_filblks_t len,
struct xfs_bmbt_irec *got,
@@ -4141,7 +4145,7 @@ 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);
@@ -4200,7 +4204,7 @@ 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
@@ -4232,6 +4236,7 @@ out_unreserve_quota:
int
xfs_bmapi_delay(
struct xfs_inode *ip, /* incore inode */
+ int whichfork, /* data or cow fork? */
xfs_fileoff_t bno, /* starting file offs. mapped */
xfs_filblks_t len, /* length to map in file */
struct xfs_bmbt_irec *mval, /* output: map values */
@@ -4239,7 +4244,7 @@ xfs_bmapi_delay(
int flags) /* XFS_BMAPI_... */
{
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);
struct xfs_bmbt_irec got; /* current file extent record */
struct xfs_bmbt_irec prev; /* previous file extent record */
xfs_fileoff_t obno; /* old block number (offset) */
@@ -4249,14 +4254,15 @@ xfs_bmapi_delay(
int n = 0; /* current extent index */
int error = 0;
+ ASSERT(whichfork == XFS_DATA_FORK || whichfork == XFS_COW_FORK);
ASSERT(*nmap >= 1);
ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
ASSERT(!(flags & ~XFS_BMAPI_ENTIRE));
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (unlikely(XFS_TEST_ERROR(
- (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
- XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
+ (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmapi_delay", XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
@@ -4267,19 +4273,20 @@ xfs_bmapi_delay(
XFS_STATS_INC(mp, xs_blk_mapw);
- if (!(ifp->if_flags & XFS_IFEXTENTS)) {
- error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
+ if (whichfork == XFS_DATA_FORK && !(ifp->if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(NULL, ip, whichfork);
if (error)
return error;
}
- xfs_bmap_search_extents(ip, bno, XFS_DATA_FORK, &eof, &lastx, &got, &prev);
+ xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, &prev);
end = bno + len;
obno = bno;
while (bno < end && n < *nmap) {
if (eof || got.br_startoff > bno) {
- error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got,
+ error = xfs_bmapi_reserve_delalloc(ip, whichfork,
+ bno, len, &got,
&prev, &lastx, eof);
if (error) {
if (n == 0) {
diff --git a/libxfs/xfs_bmap.h b/libxfs/xfs_bmap.h
index b7df7d4..c9f29b3 100644
--- a/libxfs/xfs_bmap.h
+++ b/libxfs/xfs_bmap.h
@@ -208,7 +208,7 @@ int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip,
int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
xfs_filblks_t len, struct xfs_bmbt_irec *mval,
int *nmap, int flags);
-int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno,
+int xfs_bmapi_delay(struct xfs_inode *ip, int whichfork, xfs_fileoff_t bno,
xfs_filblks_t len, struct xfs_bmbt_irec *mval,
int *nmap, int flags);
int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
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