xfs: support bmapping delalloc extents in the CoW fork

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>

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index dc24dd0..ffe4743 100644 (file)
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -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

diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
index 8774127..c6fd52f 100644 (file)
--- a/fs/xfs/libxfs/xfs_bmap.h
+++ b/fs/xfs/libxfs/xfs_bmap.h
@@ -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,

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index c08253e..59c7beb 100644 (file)
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -609,7 +609,7 @@ xfs_file_iomap_begin_delay(
        }
 
 retry:
-       error = xfs_bmapi_reserve_delalloc(ip, offset_fsb,
+       error = xfs_bmapi_reserve_delalloc(ip, XFS_DATA_FORK, offset_fsb,
                        end_fsb - offset_fsb, &got,
                        &prev, &idx, eof);
        switch (error) {

diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index ae59c3c..adfb43d 100644 (file)
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -3329,16 +3329,17 @@ DEFINE_INODE_ERROR_EVENT(xfs_reflink_dirty_page_error);
 
 /* copy on write */
 DEFINE_INODE_IREC_EVENT(xfs_reflink_trim_around_shared);
+DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_alloc);
+DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_found);
+DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_enospc);
 
 DEFINE_RW_EVENT(xfs_reflink_reserve_cow_range);
-DEFINE_INODE_IREC_EVENT(xfs_reflink_reserve_cow_extent);
 DEFINE_RW_EVENT(xfs_reflink_allocate_cow_range);
 DEFINE_INODE_IREC_EVENT(xfs_reflink_allocate_cow_extent);
 
 DEFINE_INODE_IREC_EVENT(xfs_reflink_bounce_dio_write);
 DEFINE_IOMAP_EVENT(xfs_reflink_find_cow_mapping);
 DEFINE_INODE_IREC_EVENT(xfs_reflink_trim_irec);
-DEFINE_SIMPLE_IO_EVENT(xfs_iomap_cow_delay);
 
 DEFINE_SIMPLE_IO_EVENT(xfs_reflink_cancel_cow_range);
 DEFINE_SIMPLE_IO_EVENT(xfs_reflink_end_cow);
@@ -3346,7 +3347,6 @@ DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_remap);
 DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_remap_piece);
 
 DEFINE_INODE_ERROR_EVENT(xfs_reflink_reserve_cow_range_error);
-DEFINE_INODE_ERROR_EVENT(xfs_reflink_reserve_cow_extent_error);
 DEFINE_INODE_ERROR_EVENT(xfs_reflink_allocate_cow_range_error);
 DEFINE_INODE_ERROR_EVENT(xfs_reflink_cancel_cow_range_error);
 DEFINE_INODE_ERROR_EVENT(xfs_reflink_end_cow_error);