diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_symlink_remote.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_symlink_remote.c | 167 |
1 files changed, 158 insertions, 9 deletions
diff --git a/fs/xfs/libxfs/xfs_symlink_remote.c b/fs/xfs/libxfs/xfs_symlink_remote.c index bdc777b9ec4a..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 @@ -175,7 +178,7 @@ xfs_symlink_local_to_remote( if (!xfs_has_crc(mp)) { bp->b_ops = NULL; - memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes); + memcpy(bp->b_addr, ifp->if_data, ifp->if_bytes); xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1); return; } @@ -191,7 +194,7 @@ xfs_symlink_local_to_remote( buf = bp->b_addr; buf += xfs_symlink_hdr_set(mp, ip->i_ino, 0, ifp->if_bytes, bp); - memcpy(buf, ifp->if_u1.if_data, ifp->if_bytes); + memcpy(buf, ifp->if_data, ifp->if_bytes); xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsymlink_hdr) + ifp->if_bytes - 1); } @@ -202,15 +205,11 @@ xfs_symlink_local_to_remote( */ xfs_failaddr_t xfs_symlink_shortform_verify( - struct xfs_inode *ip) + void *sfp, + int64_t size) { - struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK); - char *sfp = (char *)ifp->if_u1.if_data; - int size = ifp->if_bytes; char *endp = sfp + size; - ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL); - /* * Zero length symlinks should never occur in memory as they are * never allowed to exist on disk. @@ -231,3 +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; +} |