/* * dir.c * * PURPOSE * Directory handling routines for the OSTA-UDF(tm) filesystem. * * COPYRIGHT * This file is distributed under the terms of the GNU General Public * License (GPL). Copies of the GPL can be obtained from: * ftp://prep.ai.mit.edu/pub/gnu/GPL * Each contributing author retains all rights to their own work. * * (C) 1998-2004 Ben Fennema * * HISTORY * * 10/05/98 dgb Split directory operations into its own file * Implemented directory reads via do_udf_readdir * 10/06/98 Made directory operations work! * 11/17/98 Rewrote directory to support ICBTAG_FLAG_AD_LONG * 11/25/98 blf Rewrote directory handling (readdir+lookup) to support reading * across blocks. * 12/12/98 Split out the lookup code to namei.c. bulk of directory * code now in directory.c:udf_fileident_read. */ #include "udfdecl.h" #include #include #include #include #include #include "udf_i.h" #include "udf_sb.h" static int udf_readdir(struct file *file, struct dir_context *ctx) { struct inode *dir = file_inode(file); struct udf_inode_info *iinfo = UDF_I(dir); struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL}; struct fileIdentDesc *fi = NULL; struct fileIdentDesc cfi; int block, iblock; loff_t nf_pos; int flen; unsigned char *fname = NULL, *copy_name = NULL; unsigned char *nameptr; uint16_t liu; uint8_t lfi; loff_t size = udf_ext0_offset(dir) + dir->i_size; struct buffer_head *tmp, *bha[16]; struct kernel_lb_addr eloc; uint32_t elen; sector_t offset; int i, num, ret = 0; struct extent_position epos = { NULL, 0, {0, 0} }; struct super_block *sb = dir->i_sb; if (ctx->pos == 0) { if (!dir_emit_dot(file, ctx)) return 0; ctx->pos = 1; } nf_pos = (ctx->pos - 1) << 2; if (nf_pos >= size) goto out; fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); if (!fname) { ret = -ENOMEM; goto out; } if (nf_pos == 0) nf_pos = udf_ext0_offset(dir); fibh.soffset = fibh.eoffset = nf_pos & (sb->s_blocksize - 1); if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { if (inode_bmap(dir, nf_pos >> sb->s_blocksize_bits, &epos, &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { ret = -ENOENT; goto out; } block = udf_get_lb_pblock(sb, &eloc, offset); if ((++offset << sb->s_blocksize_bits) < elen) { if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) epos.offset -= sizeof(struct short_ad); else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) epos.offset -= sizeof(struct long_ad); } else { offset = 0; } if (!(fibh.sbh = fibh.ebh = udf_tread(sb, block))) { ret = -EIO; goto out; } if (!(offset & ((16 >> (sb->s_blocksize_bits - 9)) - 1))) { i = 16 >> (sb->s_blocksize_bits - 9); if (i + offset > (elen >> sb->s_blocksize_bits)) i = (elen >> sb->s_blocksize_bits) - offset; for (num = 0; i > 0; i--) { block = udf_get_lb_pblock(sb, &eloc, offset + i); tmp = udf_tgetblk(sb, block); if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp)) bha[num++] = tmp; else brelse(tmp); } if (num) { ll_rw_block(REQ_OP_READ, REQ_RAHEAD, num, bha); for (i = 0; i < num; i++) brelse(bha[i]); } } } while (nf_pos < size) { struct kernel_lb_addr tloc; ctx->pos = (nf_pos >> 2) + 1; fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc, &elen, &offset); if (!fi) goto out; liu = le16_to_cpu(cfi.lengthOfImpUse); lfi = cfi.lengthFileIdent; if (fibh.sbh == fibh.ebh) { nameptr = fi->fileIdent + liu; } else { int poffset; /* Unpaded ending offset */ poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi; if (poffset >= lfi) { nameptr = (char *)(fibh.ebh->b_data + poffset - lfi); } else { if (!copy_name) { copy_name = kmalloc(UDF_NAME_LEN, GFP_NOFS); if (!copy_name) { ret = -ENOMEM; goto out; } } nameptr = copy_name; memcpy(nameptr, fi->fileIdent + liu, lfi - poffset); memcpy(nameptr + lfi - poffset, fibh.ebh->b_data, poffset); } } if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) continue; } if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) continue; } if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) { if (!dir_emit_dotdot(file, ctx)) goto out; continue; } flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN); if (flen < 0) continue; tloc = lelb_to_cpu(cfi.icb.extLocation); iblock = udf_get_lb_pblock(sb, &tloc, 0); if (!dir_emit(ctx, fname, flen, iblock, DT_UNKNOWN)) goto out; } /* end while */ ctx->pos = (nf_pos >> 2) + 1; out: if (fibh.sbh != fibh.ebh) brelse(fibh.ebh); brelse(fibh.sbh); brelse(epos.bh); kfree(fname); kfree(copy_name); return ret; } /* readdir and lookup functions */ const struct file_operations udf_dir_operations = { .llseek = generic_file_llseek, .read = generic_read_dir, .iterate_shared = udf_readdir, .unlocked_ioctl = udf_ioctl, .fsync = generic_file_fsync, }; 42810bed95100a3d912679d8864421ec (patch) tree7f93e2f906b1c86f5b76c0f4c0978d41a8a29861 /net/ax25/TODO parent83b5d1e3d3013dbf90645a5d07179d018c8243fa (diff)
parisc: Don't use BITS_PER_LONG in userspace-exported swab.h header
In swab.h the "#if BITS_PER_LONG > 32" breaks compiling userspace programs if BITS_PER_LONG is #defined by userspace with the sizeof() compiler builtin. Solve this problem by using __BITS_PER_LONG instead. Since we now #include asm/bitsperlong.h avoid further potential userspace pollution by moving the #define of SHIFT_PER_LONG to bitops.h which is not exported to userspace. This patch unbreaks compiling qemu on hppa/parisc. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org>
Diffstat (limited to 'net/ax25/TODO')