/* * linux/fs/hfsplus/options.c * * Copyright (C) 2001 * Brad Boyer (flar@allandria.com) * (C) 2003 Ardis Technologies * * Option parsing */ #include #include #include #include #include #include #include #include #include "hfsplus_fs.h" enum { opt_creator, opt_type, opt_umask, opt_uid, opt_gid, opt_part, opt_session, opt_nls, opt_nodecompose, opt_decompose, opt_barrier, opt_nobarrier, opt_force, opt_err }; static const match_table_t tokens = { { opt_creator, "creator=%s" }, { opt_type, "type=%s" }, { opt_umask, "umask=%o" }, { opt_uid, "uid=%u" }, { opt_gid, "gid=%u" }, { opt_part, "part=%u" }, { opt_session, "session=%u" }, { opt_nls, "nls=%s" }, { opt_decompose, "decompose" }, { opt_nodecompose, "nodecompose" }, { opt_barrier, "barrier" }, { opt_nobarrier, "nobarrier" }, { opt_force, "force" }, { opt_err, NULL } }; /* Initialize an options object to reasonable defaults */ void hfsplus_fill_defaults(struct hfsplus_sb_info *opts) { if (!opts) return; opts->creator = HFSPLUS_DEF_CR_TYPE; opts->type = HFSPLUS_DEF_CR_TYPE; opts->umask = current_umask(); opts->uid = current_uid(); opts->gid = current_gid(); opts->part = -1; opts->session = -1; } /* convert a "four byte character" to a 32 bit int with error checks */ static inline int match_fourchar(substring_t *arg, u32 *result) { if (arg->to - arg->from != 4) return -EINVAL; memcpy(result, arg->from, 4); return 0; } int hfsplus_parse_options_remount(char *input, int *force) { char *p; substring_t args[MAX_OPT_ARGS]; int token; if (!input) return 1; while ((p = strsep(&input, ",")) != NULL) { if (!*p) continue; token = match_token(p, tokens, args); switch (token) { case opt_force: *force = 1; break; default: break; } } return 1; } /* Parse options from mount. Returns 0 on failure */ /* input is the options passed to mount() as a string */ int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi) { char *p; substring_t args[MAX_OPT_ARGS]; int tmp, token; if (!input) goto done; while ((p = strsep(&input, ",")) != NULL) { if (!*p) continue; token = match_token(p, tokens, args); switch (token) { case opt_creator: if (match_fourchar(&args[0], &sbi->creator)) { pr_err("creator requires a 4 character value\n"); return 0; } break; case opt_type: if (match_fourchar(&args[0], &sbi->type)) { pr_err("type requires a 4 character value\n"); return 0; } break; case opt_umask: if (match_octal(&args[0], &tmp)) { pr_err("umask requires a value\n"); return 0; } sbi->umask = (umode_t)tmp; break; case opt_uid: if (match_int(&args[0], &tmp)) { pr_err("uid requires an argument\n"); return 0; } sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp); if (!uid_valid(sbi->uid)) { pr_err("invalid uid specified\n"); return 0; } break; case opt_gid: if (match_int(&args[0], &tmp)) { pr_err("gid requires an argument\n"); return 0; } sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp); if (!gid_valid(sbi->gid)) { pr_err("invalid gid specified\n"); return 0; } break; case opt_part: if (match_int(&args[0], &sbi->part)) { pr_err("part requires an argument\n"); return 0; } break; case opt_session: if (match_int(&args[0], &sbi->session)) { pr_err("session requires an argument\n"); return 0; } break; case opt_nls: if (sbi->nls) { pr_err("unable to change nls mapping\n"); return 0; } p = match_strdup(&args[0]); if (p) sbi->nls = load_nls(p); if (!sbi->nls) { pr_err("unable to load nls mapping \"%s\"\n", p); kfree(p); return 0; } kfree(p); break; case opt_decompose: clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags); break; case opt_nodecompose: set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags); break; case opt_barrier: clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags); break; case opt_nobarrier: set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags); break; case opt_force: set_bit(HFSPLUS_SB_FORCE, &sbi->flags); break; default: return 0; } } done: if (!sbi->nls) { /* try utf8 first, as this is the old default behaviour */ sbi->nls = load_nls("utf8"); if (!sbi->nls) sbi->nls = load_nls_default(); if (!sbi->nls) return 0; } return 1; } int hfsplus_show_options(struct seq_file *seq, struct dentry *root) { struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb); if (sbi->creator != HFSPLUS_DEF_CR_TYPE) seq_show_option_n(seq, "creator", (char *)&sbi->creator, 4); if (sbi->type != HFSPLUS_DEF_CR_TYPE) seq_show_option_n(seq, "type", (char *)&sbi->type, 4); seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask, from_kuid_munged(&init_user_ns, sbi->uid), from_kgid_munged(&init_user_ns, sbi->gid)); if (sbi->part >= 0) seq_printf(seq, ",part=%u", sbi->part); if (sbi->session >= 0) seq_printf(seq, ",session=%u", sbi->session); if (sbi->nls) seq_printf(seq, ",nls=%s", sbi->nls->charset); if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags)) seq_puts(seq, ",nodecompose"); if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) seq_puts(seq, ",nobarrier"); return 0; } e/include/acpi/acpi_drivers.h?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>include/acpi/acpi_drivers.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/acpi/acpi_drivers.h')