[PATCH 2/3] xfs: move remote symlink target read function to libxfs

Darrick J. Wong
2023-12-31T20:23:59Z

Move xfs_readlink_bmap_ilocked to xfs_symlink_remote.c so that the
swapext code can use it to convert a remote format symlink back to
shortform format after a metadata repair. While we're at it, fix a
broken printf prefix.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
fs/xfs/libxfs/xfs_symlink_remote.c | 77 ++++++++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_symlink_remote.h | 1
fs/xfs/scrub/symlink.c | 2 -
fs/xfs/xfs_symlink.c | 75 -----------------------------------
fs/xfs/xfs_symlink.h | 1
5 files changed, 80 insertions(+), 76 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_symlink_remote.c b/fs/xfs/libxfs/xfs_symlink_remote.c
index a809a784d1741..b1ab6bdc3834e 100644
--- a/fs/xfs/libxfs/xfs_symlink_remote.c
+++ b/fs/xfs/libxfs/xfs_symlink_remote.c
@@ -17,6 +17,9 @@
#include "xfs_buf_item.h"
#include "xfs_log.h"
#include "xfs_symlink_remote.h"
+#include "xfs_bit.h"
+#include "xfs_bmap.h"
+#include "xfs_health.h"

/*
* Each contiguous block has a header, so it is not just a simple pathlen
@@ -227,3 +230,77 @@ xfs_symlink_shortform_verify(
return __this_address;
return NULL;
}
+
+/* Read a remote symlink target into the buffer. */
+int
+xfs_symlink_remote_read(
+ struct xfs_inode *ip,
+ char *link)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
+ struct xfs_buf *bp;
+ xfs_daddr_t d;
+ char *cur_chunk;
+ int pathlen = ip->i_disk_size;
+ int nmaps = XFS_SYMLINK_MAPS;
+ int byte_cnt;
+ int n;
+ int error = 0;
+ int fsblocks = 0;
+ int offset;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
+
+ fsblocks = xfs_symlink_blocks(mp, pathlen);
+ error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0);
+ if (error)
+ goto out;
+
+ offset = 0;
+ for (n = 0; n < nmaps; n++) {
+ d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
+ byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
+
+ error = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0,
+ &bp, &xfs_symlink_buf_ops);
+ if (xfs_metadata_is_sick(error))
+ xfs_inode_mark_sick(ip, XFS_SICK_INO_SYMLINK);
+ if (error)
+ return error;
+ byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
+ if (pathlen < byte_cnt)
+ byte_cnt = pathlen;
+
+ cur_chunk = bp->b_addr;
+ if (xfs_has_crc(mp)) {
+ if (!xfs_symlink_hdr_ok(ip->i_ino, offset,
+ byte_cnt, bp)) {
+ xfs_inode_mark_sick(ip, XFS_SICK_INO_SYMLINK);
+ error = -EFSCORRUPTED;
+ xfs_alert(mp,
+"symlink header does not match required off/len/owner (0x%x/0x%x,0x%llx)",
+ offset, byte_cnt, ip->i_ino);
+ xfs_buf_relse(bp);
+ goto out;
+
+ }
+
+ cur_chunk += sizeof(struct xfs_dsymlink_hdr);
+ }
+
+ memcpy(link + offset, cur_chunk, byte_cnt);
+
+ pathlen -= byte_cnt;
+ offset += byte_cnt;
+
+ xfs_buf_relse(bp);
+ }
+ ASSERT(pathlen == 0);
+
+ link[ip->i_disk_size] = '\0';
+ error = 0;
+
+ out:
+ return error;
+}
diff --git a/fs/xfs/libxfs/xfs_symlink_remote.h b/fs/xfs/libxfs/xfs_symlink_remote.h
index c6f621a0ec053..bb83a8b8dfa66 100644
--- a/fs/xfs/libxfs/xfs_symlink_remote.h
+++ b/fs/xfs/libxfs/xfs_symlink_remote.h
@@ -18,5 +18,6 @@ bool xfs_symlink_hdr_ok(xfs_ino_t ino, uint32_t offset,
void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
struct xfs_inode *ip, struct xfs_ifork *ifp);
xfs_failaddr_t xfs_symlink_shortform_verify(void *sfp, int64_t size);
+int xfs_symlink_remote_read(struct xfs_inode *ip, char *link);

#endif /* __XFS_SYMLINK_REMOTE_H */
diff --git a/fs/xfs/scrub/symlink.c b/fs/xfs/scrub/symlink.c
index 06f8fe117cb4c..7239590c9dd29 100644
--- a/fs/xfs/scrub/symlink.c
+++ b/fs/xfs/scrub/symlink.c
@@ -68,7 +68,7 @@ xchk_symlink(
}

/* Remote symlink; must read the contents. */
- error = xfs_readlink_bmap_ilocked(sc->ip, sc->buf);
+ error = xfs_symlink_remote_read(sc->ip, sc->buf);
if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
return error;
if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
diff --git a/fs/xfs/xfs_symlink.c b/fs/xfs/xfs_symlink.c
index ca1daf8245fa6..0a9a1ad733336 100644
--- a/fs/xfs/xfs_symlink.c
+++ b/fs/xfs/xfs_symlink.c
@@ -27,79 +27,6 @@
#include "xfs_symlink_remote.h"

/* ----- Kernel only functions below ----- */
-int
-xfs_readlink_bmap_ilocked(
- struct xfs_inode *ip,
- char *link)
-{
- struct xfs_mount *mp = ip->i_mount;
- struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
- struct xfs_buf *bp;
- xfs_daddr_t d;
- char *cur_chunk;
- int pathlen = ip->i_disk_size;
- int nmaps = XFS_SYMLINK_MAPS;
- int byte_cnt;
- int n;
- int error = 0;
- int fsblocks = 0;
- int offset;
-
- ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
-
- fsblocks = xfs_symlink_blocks(mp, pathlen);
- error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0);
- if (error)
- goto out;
-
- offset = 0;
- for (n = 0; n < nmaps; n++) {
- d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
- byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
-
- error = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0,
- &bp, &xfs_symlink_buf_ops);
- if (xfs_metadata_is_sick(error))
- xfs_inode_mark_sick(ip, XFS_SICK_INO_SYMLINK);
- if (error)
- return error;
- byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
- if (pathlen < byte_cnt)
- byte_cnt = pathlen;
-
- cur_chunk = bp->b_addr;
- if (xfs_has_crc(mp)) {
- if (!xfs_symlink_hdr_ok(ip->i_ino, offset,
- byte_cnt, bp)) {
- xfs_inode_mark_sick(ip, XFS_SICK_INO_SYMLINK);
- error = -EFSCORRUPTED;
- xfs_alert(mp,
-"symlink header does not match required off/len/owner (0x%x/Ox%x,0x%llx)",
- offset, byte_cnt, ip->i_ino);
- xfs_buf_relse(bp);
- goto out;
-
- }
-
- cur_chunk += sizeof(struct xfs_dsymlink_hdr);
- }
-
- memcpy(link + offset, cur_chunk, byte_cnt);
-
- pathlen -= byte_cnt;
- offset += byte_cnt;
-
- xfs_buf_relse(bp);
- }
- ASSERT(pathlen == 0);
-
- link[ip->i_disk_size] = '\0';
- error = 0;
-
- out:
- return error;
-}
-
int
xfs_readlink(
struct xfs_inode *ip,
@@ -141,7 +68,7 @@ xfs_readlink(
memcpy(link, ip->i_df.if_u1.if_data, pathlen + 1);
error = 0;
} else {
- error = xfs_readlink_bmap_ilocked(ip, link);
+ error = xfs_symlink_remote_read(ip, link);
}

xfs_iunlock(ip, XFS_ILOCK_SHARED);
diff --git a/fs/xfs/xfs_symlink.h b/fs/xfs/xfs_symlink.h
index d1ca1ce62a93b..0d29a50e66fdc 100644
--- a/fs/xfs/xfs_symlink.h
+++ b/fs/xfs/xfs_symlink.h
@@ -10,7 +10,6 @@
int xfs_symlink(struct mnt_idmap *idmap, struct xfs_inode *dp,
struct xfs_name *link_name, const char *target_path,
umode_t mode, struct xfs_inode **ipp);
-int xfs_readlink_bmap_ilocked(struct xfs_inode *ip, char *link);
int xfs_readlink(struct xfs_inode *ip, char *link);
int xfs_inactive_symlink(struct xfs_inode *ip);