int xfs_read_buf( struct xfs_mount *mp, xfs_buftarg_t *target, xfs_daddr_t blkno, int len, uint flags, xfs_buf_t **bpp) { xfs_buf_t *bp; int error; if (flags) bp = xfs_buf_read_flags(target, blkno, len, flags); else bp = xfs_buf_read(target, blkno, len, flags); if (!bp) return XFS_ERROR(EIO); error = XFS_BUF_GETERROR(bp); if (bp && !error && !XFS_FORCED_SHUTDOWN(mp)) { *bpp = bp; } else { *bpp = NULL; if (error) { xfs_ioerror_alert("xfs_read_buf", mp, bp, XFS_BUF_ADDR(bp)); } else { error = XFS_ERROR(EIO); } if (bp) { XFS_BUF_UNDONE(bp); XFS_BUF_UNDELAYWRITE(bp); XFS_BUF_STALE(bp); /* * brelse clears B_ERROR and b_error */ xfs_buf_relse(bp); } } return (error); }
int xfs_read_buf( struct xfs_mount *mp, xfs_buftarg_t *target, xfs_daddr_t blkno, int len, uint flags, xfs_buf_t **bpp) { xfs_buf_t *bp; int error; if (!flags) flags = XBF_LOCK | XBF_MAPPED; bp = xfs_buf_read(target, blkno, len, flags); if (!bp) return XFS_ERROR(EIO); error = bp->b_error; if (!error && !XFS_FORCED_SHUTDOWN(mp)) { *bpp = bp; } else { *bpp = NULL; if (error) { xfs_buf_ioerror_alert(bp, __func__); } else { error = XFS_ERROR(EIO); } if (bp) { XFS_BUF_UNDONE(bp); xfs_buf_stale(bp); xfs_buf_relse(bp); } } return (error); }
/* ----- Kernel only functions below ----- */ STATIC int xfs_readlink_bmap( 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_d.di_size; int nmaps = XFS_SYMLINK_MAPS; int byte_cnt; int n; int error = 0; int fsblocks = 0; int offset; 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); bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0, &xfs_symlink_buf_ops); if (!bp) return XFS_ERROR(ENOMEM); error = bp->b_error; if (error) { xfs_buf_ioerror_alert(bp, __func__); xfs_buf_relse(bp); /* bad CRC means corrupted metadata */ if (error == EFSBADCRC) error = EFSCORRUPTED; goto out; } byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt); if (pathlen < byte_cnt) byte_cnt = pathlen; cur_chunk = bp->b_addr; if (xfs_sb_version_hascrc(&mp->m_sb)) { if (!xfs_symlink_hdr_ok(mp, ip->i_ino, offset, byte_cnt, bp)) { 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, bp->b_addr, byte_cnt); pathlen -= byte_cnt; offset += byte_cnt; xfs_buf_relse(bp); } ASSERT(pathlen == 0); link[ip->i_d.di_size] = '\0'; error = 0; out: return error; }