/* * 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, }; 8c8b79c321e4a1f31f98194e4f6b6cae7 (patch) tree370efda701f03cccf21e02bb1fdd3b852547d75c /include/dt-bindings/mfd/atmel-flexcom.h parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/dt-bindings/mfd/atmel-flexcom.h')