summaryrefslogtreecommitdiffstats
path: root/fs/xfs/libxfs/xfs_inode_fork.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/xfs/libxfs/xfs_inode_fork.c')
-rw-r--r--fs/xfs/libxfs/xfs_inode_fork.c77
1 files changed, 65 insertions, 12 deletions
diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
index 5dd56d3..222e103 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.c
+++ b/fs/xfs/libxfs/xfs_inode_fork.c
@@ -775,6 +775,13 @@ xfs_idestroy_fork(
}
}
+/* Count number of incore extents based on if_bytes */
+xfs_extnum_t
+xfs_iext_count(struct xfs_ifork *ifp)
+{
+ return ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+}
+
/*
* Convert in-core extents to on-disk form
*
@@ -803,7 +810,7 @@ xfs_iextents_copy(
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
ASSERT(ifp->if_bytes > 0);
- nrecs = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ nrecs = xfs_iext_count(ifp);
XFS_BMAP_TRACE_EXLIST(ip, nrecs, whichfork);
ASSERT(nrecs > 0);
@@ -941,7 +948,7 @@ xfs_iext_get_ext(
xfs_extnum_t idx) /* index of target extent */
{
ASSERT(idx >= 0);
- ASSERT(idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t));
+ ASSERT(idx < xfs_iext_count(ifp));
if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) {
return ifp->if_u1.if_ext_irec->er_extbuf;
@@ -1017,7 +1024,7 @@ xfs_iext_add(
int new_size; /* size of extents after adding */
xfs_extnum_t nextents; /* number of extents in file */
- nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ nextents = xfs_iext_count(ifp);
ASSERT((idx >= 0) && (idx <= nextents));
byte_diff = ext_diff * sizeof(xfs_bmbt_rec_t);
new_size = ifp->if_bytes + byte_diff;
@@ -1241,7 +1248,7 @@ xfs_iext_remove(
trace_xfs_iext_remove(ip, idx, state, _RET_IP_);
ASSERT(ext_diff > 0);
- nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ nextents = xfs_iext_count(ifp);
new_size = (nextents - ext_diff) * sizeof(xfs_bmbt_rec_t);
if (new_size == 0) {
@@ -1270,7 +1277,7 @@ xfs_iext_remove_inline(
ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
ASSERT(idx < XFS_INLINE_EXTS);
- nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ nextents = xfs_iext_count(ifp);
ASSERT(((nextents - ext_diff) > 0) &&
(nextents - ext_diff) < XFS_INLINE_EXTS);
@@ -1309,7 +1316,7 @@ xfs_iext_remove_direct(
ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
new_size = ifp->if_bytes -
(ext_diff * sizeof(xfs_bmbt_rec_t));
- nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ nextents = xfs_iext_count(ifp);
if (new_size == 0) {
xfs_iext_destroy(ifp);
@@ -1546,7 +1553,7 @@ xfs_iext_indirect_to_direct(
int size; /* size of file extents */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
- nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ nextents = xfs_iext_count(ifp);
ASSERT(nextents <= XFS_LINEAR_EXTS);
size = nextents * sizeof(xfs_bmbt_rec_t);
@@ -1620,7 +1627,7 @@ xfs_iext_bno_to_ext(
xfs_extnum_t nextents; /* number of file extents */
xfs_fileoff_t startoff = 0; /* start offset of extent */
- nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ nextents = xfs_iext_count(ifp);
if (nextents == 0) {
*idxp = 0;
return NULL;
@@ -1733,8 +1740,8 @@ xfs_iext_idx_to_irec(
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
ASSERT(page_idx >= 0);
- ASSERT(page_idx <= ifp->if_bytes / sizeof(xfs_bmbt_rec_t));
- ASSERT(page_idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t) || realloc);
+ ASSERT(page_idx <= xfs_iext_count(ifp));
+ ASSERT(page_idx < xfs_iext_count(ifp) || realloc);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
erp_idx = 0;
@@ -1782,7 +1789,7 @@ xfs_iext_irec_init(
xfs_extnum_t nextents; /* number of extents in file */
ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
- nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ nextents = xfs_iext_count(ifp);
ASSERT(nextents <= XFS_LINEAR_EXTS);
erp = kmem_alloc(sizeof(xfs_ext_irec_t), KM_NOFS);
@@ -1906,7 +1913,7 @@ xfs_iext_irec_compact(
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
- nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ nextents = xfs_iext_count(ifp);
if (nextents == 0) {
xfs_iext_destroy(ifp);
@@ -1996,3 +2003,49 @@ xfs_ifork_init_cow(
ip->i_cformat = XFS_DINODE_FMT_EXTENTS;
ip->i_cnextents = 0;
}
+
+/*
+ * Lookup the extent covering bno.
+ *
+ * If there is an extent covering bno return the extent index, and store the
+ * expanded extent structure in *gotp, and the extent index in *idx.
+ * If there is no extent covering bno, but there is an extent after it (e.g.
+ * it lies in a hole) return that extent in *gotp and its index in *idx
+ * instead.
+ * If bno is beyond the last extent return false, and return the index after
+ * the last valid index in *idxp.
+ */
+bool
+xfs_iext_lookup_extent(
+ struct xfs_inode *ip,
+ struct xfs_ifork *ifp,
+ xfs_fileoff_t bno,
+ xfs_extnum_t *idxp,
+ struct xfs_bmbt_irec *gotp)
+{
+ struct xfs_bmbt_rec_host *ep;
+
+ XFS_STATS_INC(ip->i_mount, xs_look_exlist);
+
+ ep = xfs_iext_bno_to_ext(ifp, bno, idxp);
+ if (!ep)
+ return false;
+ xfs_bmbt_get_all(ep, gotp);
+ return true;
+}
+
+/*
+ * Return true if there is an extent at index idx, and return the expanded
+ * extent structure at idx in that case. Else return false.
+ */
+bool
+xfs_iext_get_extent(
+ struct xfs_ifork *ifp,
+ xfs_extnum_t idx,
+ struct xfs_bmbt_irec *gotp)
+{
+ if (idx < 0 || idx >= xfs_iext_count(ifp))
+ return false;
+ xfs_bmbt_get_all(xfs_iext_get_ext(ifp, idx), gotp);
+ return true;
+}
OpenPOWER on IntegriCloud