[PATCH V8 05/19] xfs: Introduce xfs_dfork_nextents() helper

Chandan Babu R
2022-03-21T05:18:34Z

This commit replaces the macro XFS_DFORK_NEXTENTS() with the helper function
xfs_dfork_nextents(). As of this commit, xfs_dfork_nextents() returns the same
value as XFS_DFORK_NEXTENTS(). A future commit which extends inode's extent
counter fields will add more logic to this helper.

This commit also replaces direct accesses to xfs_dinode->di_[a]nextents
with calls to xfs_dfork_nextents().

No functional changes have been made.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
---
fs/xfs/libxfs/xfs_format.h | 4 ----
fs/xfs/libxfs/xfs_inode_buf.c | 17 ++++++++++++-----
fs/xfs/libxfs/xfs_inode_fork.c | 8 ++++----
fs/xfs/libxfs/xfs_inode_fork.h | 32 ++++++++++++++++++++++++++++++++
fs/xfs/scrub/inode.c | 18 ++++++++++--------
5 files changed, 58 insertions(+), 21 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 66594853a88b..b5e9256d6d32 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -924,10 +924,6 @@ enum xfs_dinode_fmt {
((w) == XFS_DATA_FORK ? \
(dip)->di_format : \
(dip)->di_aformat)
-#define XFS_DFORK_NEXTENTS(dip,w) \
- ((w) == XFS_DATA_FORK ? \
- be32_to_cpu((dip)->di_nextents) : \
- be16_to_cpu((dip)->di_anextents))

/*
* For block and character special files the 32bit dev_t is stored at the
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index 7cad307840b3..f0e063835318 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -336,9 +336,11 @@ xfs_dinode_verify_fork(
struct xfs_mount *mp,
int whichfork)
{
- xfs_extnum_t di_nextents = XFS_DFORK_NEXTENTS(dip, whichfork);
+ xfs_extnum_t di_nextents;
xfs_extnum_t max_extents;

+ di_nextents = xfs_dfork_nextents(dip, whichfork);
+
switch (XFS_DFORK_FORMAT(dip, whichfork)) {
case XFS_DINODE_FMT_LOCAL:
/*
@@ -405,6 +407,9 @@ xfs_dinode_verify(
uint16_t flags;
uint64_t flags2;
uint64_t di_size;
+ xfs_extnum_t nextents;
+ xfs_extnum_t naextents;
+ xfs_filblks_t nblocks;

if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
return __this_address;
@@ -435,10 +440,12 @@ xfs_dinode_verify(
if ((S_ISLNK(mode) || S_ISDIR(mode)) && di_size == 0)
return __this_address;

+ nextents = xfs_dfork_data_extents(dip);
+ naextents = xfs_dfork_attr_extents(dip);
+ nblocks = be64_to_cpu(dip->di_nblocks);
+
/* Fork checks carried over from xfs_iformat_fork */
- if (mode &&
- be32_to_cpu(dip->di_nextents) + be16_to_cpu(dip->di_anextents) >
- be64_to_cpu(dip->di_nblocks))
+ if (mode && nextents + naextents > nblocks)
return __this_address;

if (mode && XFS_DFORK_BOFF(dip) > mp->m_sb.sb_inodesize)
@@ -495,7 +502,7 @@ xfs_dinode_verify(
default:
return __this_address;
}
- if (dip->di_anextents)
+ if (naextents)
return __this_address;
}

diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
index a17c4d87520a..1cf48cee45e3 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.c
+++ b/fs/xfs/libxfs/xfs_inode_fork.c
@@ -105,7 +105,7 @@ xfs_iformat_extents(
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
int state = xfs_bmap_fork_to_state(whichfork);
- xfs_extnum_t nex = XFS_DFORK_NEXTENTS(dip, whichfork);
+ xfs_extnum_t nex = xfs_dfork_nextents(dip, whichfork);
int size = nex * sizeof(xfs_bmbt_rec_t);
struct xfs_iext_cursor icur;
struct xfs_bmbt_rec *dp;
@@ -230,7 +230,7 @@ xfs_iformat_data_fork(
* depend on it.
*/
ip->i_df.if_format = dip->di_format;
- ip->i_df.if_nextents = be32_to_cpu(dip->di_nextents);
+ ip->i_df.if_nextents = xfs_dfork_data_extents(dip);

switch (inode->i_mode & S_IFMT) {
case S_IFIFO:
@@ -295,14 +295,14 @@ xfs_iformat_attr_fork(
struct xfs_inode *ip,
struct xfs_dinode *dip)
{
+ xfs_extnum_t naextents = xfs_dfork_attr_extents(dip);
int error = 0;

/*
* Initialize the extent count early, as the per-format routines may
* depend on it.
*/
- ip->i_afp = xfs_ifork_alloc(dip->di_aformat,
- be16_to_cpu(dip->di_anextents));
+ ip->i_afp = xfs_ifork_alloc(dip->di_aformat, naextents);

switch (ip->i_afp->if_format) {
case XFS_DINODE_FMT_LOCAL:
diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h
index 2605f7ff8fc1..7ed2ecb51bca 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.h
+++ b/fs/xfs/libxfs/xfs_inode_fork.h
@@ -141,6 +141,38 @@ static inline xfs_extnum_t xfs_iext_max_nextents(int whichfork)
return MAXAEXTNUM;
}

+static inline xfs_extnum_t
+xfs_dfork_data_extents(
+ struct xfs_dinode *dip)
+{
+ return be32_to_cpu(dip->di_nextents);
+}
+
+static inline xfs_extnum_t
+xfs_dfork_attr_extents(
+ struct xfs_dinode *dip)
+{
+ return be16_to_cpu(dip->di_anextents);
+}
+
+static inline xfs_extnum_t
+xfs_dfork_nextents(
+ struct xfs_dinode *dip,
+ int whichfork)
+{
+ switch (whichfork) {
+ case XFS_DATA_FORK:
+ return xfs_dfork_data_extents(dip);
+ case XFS_ATTR_FORK:
+ return xfs_dfork_attr_extents(dip);
+ default:
+ ASSERT(0);
+ break;
+ }
+
+ return 0;
+}
+
struct xfs_ifork *xfs_ifork_alloc(enum xfs_dinode_fmt format,
xfs_extnum_t nextents);
struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
diff --git a/fs/xfs/scrub/inode.c b/fs/xfs/scrub/inode.c
index 87925761e174..51820b40ab1c 100644
--- a/fs/xfs/scrub/inode.c
+++ b/fs/xfs/scrub/inode.c
@@ -233,6 +233,7 @@ xchk_dinode(
unsigned long long isize;
uint64_t flags2;
xfs_extnum_t nextents;
+ xfs_extnum_t naextents;
prid_t prid;
uint16_t flags;
uint16_t mode;
@@ -390,8 +391,10 @@ xchk_dinode(

xchk_inode_extsize(sc, dip, ino, mode, flags);

+ nextents = xfs_dfork_data_extents(dip);
+ naextents = xfs_dfork_attr_extents(dip);
+
/* di_nextents */
- nextents = be32_to_cpu(dip->di_nextents);
fork_recs = XFS_DFORK_DSIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
switch (dip->di_format) {
case XFS_DINODE_FMT_EXTENTS:
@@ -411,7 +414,7 @@ xchk_dinode(
/* di_forkoff */
if (XFS_DFORK_APTR(dip) >= (char *)dip + mp->m_sb.sb_inodesize)
xchk_ino_set_corrupt(sc, ino);
- if (dip->di_anextents != 0 && dip->di_forkoff == 0)
+ if (naextents != 0 && dip->di_forkoff == 0)
xchk_ino_set_corrupt(sc, ino);
if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS)
xchk_ino_set_corrupt(sc, ino);
@@ -423,19 +426,18 @@ xchk_dinode(
xchk_ino_set_corrupt(sc, ino);

/* di_anextents */
- nextents = be16_to_cpu(dip->di_anextents);
fork_recs = XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
switch (dip->di_aformat) {
case XFS_DINODE_FMT_EXTENTS:
- if (nextents > fork_recs)
+ if (naextents > fork_recs)
xchk_ino_set_corrupt(sc, ino);
break;
case XFS_DINODE_FMT_BTREE:
- if (nextents <= fork_recs)
+ if (naextents <= fork_recs)
xchk_ino_set_corrupt(sc, ino);
break;
default:
- if (nextents != 0)
+ if (naextents != 0)
xchk_ino_set_corrupt(sc, ino);
}

@@ -513,14 +515,14 @@ xchk_inode_xref_bmap(
&nextents, &count);
if (!xchk_should_check_xref(sc, &error, NULL))
return;
- if (nextents < be32_to_cpu(dip->di_nextents))
+ if (nextents < xfs_dfork_data_extents(dip))
xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);

error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK,
&nextents, &acount);
if (!xchk_should_check_xref(sc, &error, NULL))
return;
- if (nextents != be16_to_cpu(dip->di_anextents))
+ if (nextents != xfs_dfork_attr_extents(dip))
xchk_ino_xref_set_corrupt(sc, sc->ip->i_ino);

/* Check nblocks against the inode. */
--
2.30.2