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path: root/fs/xfs/libxfs/xfs_symlink_remote.c
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Diffstat (limited to 'fs/xfs/libxfs/xfs_symlink_remote.c')
-rw-r--r--fs/xfs/libxfs/xfs_symlink_remote.c155
1 files changed, 154 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_symlink_remote.c b/fs/xfs/libxfs/xfs_symlink_remote.c
index 160aa20aa441..ffb1317a9212 100644
--- a/fs/xfs/libxfs/xfs_symlink_remote.c
+++ b/fs/xfs/libxfs/xfs_symlink_remote.c
@@ -16,7 +16,10 @@
#include "xfs_trans.h"
#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 +230,153 @@ 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;
+
+ xfs_assert_ilocked(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;
+}
+
+/* Write the symlink target into the inode. */
+int
+xfs_symlink_write_target(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ const char *target_path,
+ int pathlen,
+ xfs_fsblock_t fs_blocks,
+ uint resblks)
+{
+ struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
+ struct xfs_mount *mp = tp->t_mountp;
+ const char *cur_chunk;
+ struct xfs_buf *bp;
+ xfs_daddr_t d;
+ int byte_cnt;
+ int nmaps;
+ int offset = 0;
+ int n;
+ int error;
+
+ /*
+ * If the symlink will fit into the inode, write it inline.
+ */
+ if (pathlen <= xfs_inode_data_fork_size(ip)) {
+ xfs_init_local_fork(ip, XFS_DATA_FORK, target_path, pathlen);
+
+ ip->i_disk_size = pathlen;
+ ip->i_df.if_format = XFS_DINODE_FMT_LOCAL;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
+ return 0;
+ }
+
+ nmaps = XFS_SYMLINK_MAPS;
+ error = xfs_bmapi_write(tp, ip, 0, fs_blocks, XFS_BMAPI_METADATA,
+ resblks, mval, &nmaps);
+ if (error)
+ return error;
+
+ ip->i_disk_size = pathlen;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+ cur_chunk = target_path;
+ offset = 0;
+ for (n = 0; n < nmaps; n++) {
+ char *buf;
+
+ d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
+ byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
+ error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
+ BTOBB(byte_cnt), 0, &bp);
+ if (error)
+ return error;
+ bp->b_ops = &xfs_symlink_buf_ops;
+
+ byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
+ byte_cnt = min(byte_cnt, pathlen);
+
+ buf = bp->b_addr;
+ buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset, byte_cnt,
+ bp);
+
+ memcpy(buf, cur_chunk, byte_cnt);
+
+ cur_chunk += byte_cnt;
+ pathlen -= byte_cnt;
+ offset += byte_cnt;
+
+ xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);
+ xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -
+ (char *)bp->b_addr);
+ }
+ ASSERT(pathlen == 0);
+ return 0;
+}