From: Junjiro Okajima <hooanon05@xxxxxxxxxxx> initial commit aufs sysfs interface Signed-off-by: Junjiro Okajima <hooanon05@xxxxxxxxxxx> --- fs/aufs/sysfs.c | 459 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 459 insertions(+), 0 deletions(-) diff --git a/fs/aufs/sysfs.c b/fs/aufs/sysfs.c new file mode 100644 index 0000000..eb0d367 --- /dev/null +++ b/fs/aufs/sysfs.c @@ -0,0 +1,459 @@ +/* + * Copyright (C) 2007-2008 Junjiro Okajima + * + * This program, aufs is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* + * sysfs interface + * + * $Id: sysfs.c,v 1.3 2008/05/12 00:27:58 sfjro Exp $ + */ + +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/seq_file.h> +#include <linux/sysfs.h> +#include "aufs.h" + + +#ifdef CONFIG_AUFS_LOCAL +static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ +#define conf_bool(name) "CONFIG_AUFS_" #name "=y\n" + static const char opt[] = +#ifdef CONFIG_AUFS + "CONFIG_AUFS=y\n" +#else + "CONFIG_AUFS=m\n" +#endif +#ifdef CONFIG_AUFS_FAKE_DM + conf_bool(FAKE_DM) +#endif +#ifdef CONFIG_AUFS_BRANCH_MAX_127 + conf_bool(BRANCH_MAX_127) +#elif defined(CONFIG_AUFS_BRANCH_MAX_511) + conf_bool(BRANCH_MAX_511) +#elif defined(CONFIG_AUFS_BRANCH_MAX_1023) + conf_bool(BRANCH_MAX_1023) +#elif defined(CONFIG_AUFS_BRANCH_MAX_32767) + conf_bool(BRANCH_MAX_32767) +#endif +#ifdef CONFIG_AUFS_HINOTIFY + conf_bool(HINOTIFY) +#endif +#ifdef CONFIG_AUFS_EXPORT + conf_bool(EXPORT) +#endif +#ifdef CONFIG_AUFS_ROBR + conf_bool(ROBR) +#endif +#ifdef CONFIG_AUFS_SHWH + conf_bool(SHWH) +#endif +#ifdef CONFIG_AUFS_DLGT + conf_bool(DLGT) +#endif +#ifdef CONFIG_AUFS_RR_SQUASHFS + conf_bool(RR_SQUASHFS) +#endif +#ifdef CONFIG_AUFS_SEC_PERM_PATCH + conf_bool(SEC_PERM_PATCH) +#endif +#ifdef CONFIG_AUFS_SPLICE_PATCH + conf_bool(SPLICE_PATCH) +#endif +#ifdef CONFIG_AUFS_PUT_FILP_PATCH + conf_bool(PUT_FILP_PATCH) +#endif +#ifdef CONFIG_AUFS_LHASH_PATCH + conf_bool(LHASH_PATCH) +#endif +#ifdef CONFIG_AUFS_FSYNC_SUPER_PATCH + conf_bool(FSYNC_SUPER_PATCH) +#endif +#ifdef CONFIG_AUFS_DENY_WRITE_ACCESS_PATCH + conf_bool(DENY_WRITE_ACCESS_PATCH) +#endif +#ifdef CONFIG_AUFS_KSIZE_PATCH + conf_bool(KSIZE_PATCH) +#endif +#ifdef CONFIG_AUFS_WORKAROUND_FUSE + conf_bool(WORKAROUND_FUSE) +#endif +#ifdef CONFIG_AUFS_STAT + conf_bool(STAT) +#endif +#ifdef CONFIG_AUFS_DEBUG + conf_bool(DEBUG) +#endif +#ifdef CONFIG_AUFS_COMPAT + conf_bool(COMPAT) +#endif + +/* automatic configurations */ +#ifdef CONFIG_AUFS_BR_NFS + conf_bool(BR_NFS) +#endif +#ifdef CONFIG_AUFS_MAGIC_SYSRQ + conf_bool(MAGIC_SYSRQ) +#endif + ; +#undef conf_bool + + char *p = buf; + const char *end = buf + PAGE_SIZE; + + p += snprintf(p, end - p, "%s", opt); +#ifdef DbgUdbaRace + if (p < end) + p += snprintf(p, end - p, "DbgUdbaRace=%d\n", DbgUdbaRace); +#endif + if (p < end) + return p - buf; + else + return -EFBIG; +} + +static struct kobj_attribute au_config_attr = __ATTR_RO(config); +#endif + +#ifdef CONFIG_AUFS_STAT +static ssize_t stat_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + char *p = buf; + const char *end = buf + PAGE_SIZE; + int i; + + p += snprintf(p, end - p, "wkq max_busy:"); + for (i = 0; p < end && i < aufs_nwkq; i++) + p += snprintf(p, end - p, " %u", au_wkq[i].max_busy); + if (p < end) + p += snprintf(p, end - p, ", %u(generic)\n", + au_wkq[aufs_nwkq].max_busy); + + if (p < end) + return p - buf; + else + return -EFBIG; +} + +static struct kobj_attribute au_stat_attr = __ATTR_RO(stat); +#endif + +#ifdef CONFIG_AUFS_DEBUG +static ssize_t debug_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + return sprintf(buf, "%d\n", au_debug_test()); +} + +static ssize_t debug_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t sz) +{ + LKTRTrace("%.*s\n", (unsigned int)sz, buf); + + if (unlikely(!sz || (*buf != '0' && *buf != '1'))) + return -EOPNOTSUPP; + + if (*buf == '0') + au_debug_off(); + else if (*buf == '1') + au_debug_on(); + return sz; +} + +static struct kobj_attribute au_debug_attr = __ATTR(debug, S_IRUGO | S_IWUSR, + debug_show, debug_store); +#endif + +static struct attribute *au_attr[] = { +#ifdef CONFIG_AUFS_LOCAL + &au_config_attr.attr, +#endif +#ifdef CONFIG_AUFS_STAT + &au_stat_attr.attr, +#endif +#ifdef CONFIG_AUFS_DEBUG + &au_debug_attr.attr, +#endif + NULL, /* need to NULL terminate the list of attributes */ +}; + +static struct attribute_group au_attr_group_body = { + .attrs = au_attr +}; + +struct attribute_group *au_attr_group = &au_attr_group_body; + +/* ---------------------------------------------------------------------- */ + +/* + * they are copied from linux/lib/kobject.c, + * and will be exported in the future. + */ +static ssize_t au_attr_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + struct kobj_attribute *kattr; + ssize_t ret = -EIO; + + kattr = container_of(attr, struct kobj_attribute, attr); + if (kattr->show) + ret = kattr->show(kobj, kattr, buf); + return ret; +} + +#ifdef CONFIG_AUFS_DEBUG +static ssize_t au_attr_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + struct kobj_attribute *kattr; + ssize_t ret = -EIO; + + kattr = container_of(attr, struct kobj_attribute, attr); + if (kattr->store) + ret = kattr->store(kobj, kattr, buf, count); + return ret; +} +#endif + +static struct sysfs_ops sysaufs_ops = { + .show = au_attr_show, +#ifdef CONFIG_AUFS_DEBUG + .store = au_attr_store +#endif +}; + +static struct kobj_type au_ktype_body = { + .sysfs_ops = &sysaufs_ops +}; +struct kobj_type *au_ktype = &au_ktype_body; + +/* ---------------------------------------------------------------------- */ + +int sysaufs_sbi_xino(struct seq_file *seq, struct super_block *sb) +{ + int err, dlgt; + struct au_sbinfo *sbinfo; + unsigned int mnt_flags; + aufs_bindex_t bend, bindex; + struct file *xf; + struct kstat st; + + AuTraceEnter(); + + sbinfo = au_sbi(sb); + mnt_flags = au_mntflags(sb); + if (unlikely(!au_opt_test(mnt_flags, XINO))) { +#ifdef CONFIG_AUFS_DEBUG + AuDebugOn(sbinfo->si_xib); + bend = au_sbend(sb); + for (bindex = 0; bindex <= bend; bindex++) + AuDebugOn(au_sbr(sb, bindex)->br_xino); +#endif + err = 0; + goto out; /* success */ + } + + dlgt = !!au_opt_test_dlgt(mnt_flags); + xf = sbinfo->si_xib; + err = vfsub_getattr(xf->f_vfsmnt, xf->f_dentry, &st, dlgt); + if (!err) + seq_printf(seq, "%Lux%lu %Ld\n", + st.blocks, st.blksize, (long long)st.size); + else + seq_printf(seq, "err %d\n", err); + + bend = au_sbend(sb); + for (bindex = 0; !err && bindex <= bend; bindex++) { + xf = au_sbr(sb, bindex)->br_xino; + if (!xf) + continue; + seq_printf(seq, "%d: ", bindex); + err = vfsub_getattr(xf->f_vfsmnt, xf->f_dentry, &st, dlgt); + if (!err) + seq_printf(seq, "%d, %Lux%lu %Ld\n", + file_count(xf), st.blocks, st.blksize, + (long long)st.size); + else + seq_printf(seq, "err %d\n", err); + } + + out: + AuTraceErr(err); + return err; +} + +/* + * the lifetime of branch is independent from the entry under sysfs. + * sysfs handles the lifetime of the entry, and never call ->show() after it is + * unlinked. + */ +#define SysaufsBr_PREFIX "br" +static int sysaufs_sbi_br(struct seq_file *seq, struct super_block *sb, + aufs_bindex_t bindex) +{ + int err; + struct dentry *root; + struct au_branch *br; + struct path path; + + LKTRTrace("b%d\n", bindex); + + err = -ENOENT; + if (unlikely(au_sbend(sb) < bindex)) + goto out; + + err = 0; + root = sb->s_root; + di_read_lock_parent(root, !AuLock_IR); + br = au_sbr(sb, bindex); + path.mnt = br->br_mnt; + path.dentry = au_h_dptr(root, bindex); + seq_path(seq, &path, au_esc_chars); + di_read_unlock(root, !AuLock_IR); + seq_printf(seq, "=%s\n", au_optstr_br_perm(br->br_perm)); + + out: + AuTraceErr(err); + return err; +} + +/* ---------------------------------------------------------------------- */ + +static struct seq_file *au_seq(char *p, ssize_t len) +{ + struct seq_file *seq; + + seq = kzalloc(sizeof(*seq), GFP_TEMPORARY); + if (seq) { + //mutex_init(&seq.lock); + seq->buf = p; + seq->count = 0; + seq->size = len; + return seq; /* success */ + } + + seq = ERR_PTR(-ENOMEM); + AuTraceErrPtr(seq); + return seq; +} + +//todo: file size may exceed PAGE_SIZE +ssize_t sysaufs_sbi_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + ssize_t err; + struct au_sbinfo *sbinfo; + struct super_block *sb; + struct seq_file *seq; + char *name; + struct attribute **cattr; + + LKTRTrace("%s/%s\n", kobject_name(kobj), attr->name); + + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); + sb = sbinfo->si_sb; + si_noflush_read_lock(sb); + + seq = au_seq(buf, PAGE_SIZE); + err = PTR_ERR(seq); + if (IS_ERR(seq)) + goto out; + + name = (void *)attr->name; + cattr = au_sbi_attrs; + while (*cattr) { + if (!strcmp(name, (*cattr)->name)) { + err = container_of(*cattr, struct au_sbi_attr, attr) + ->show(seq, sb); + goto out_seq; + } + cattr++; + } + + if (!strncmp(name, SysaufsBr_PREFIX, sizeof(SysaufsBr_PREFIX) - 1)) { + name += sizeof(SysaufsBr_PREFIX) - 1; + err = sysaufs_sbi_br(seq, sb, simple_strtol(name, NULL, 10)); + goto out_seq; + } + BUG(); + + out_seq: + if (!err) { + err = seq->count; + /* sysfs limit */ + if (unlikely(err == PAGE_SIZE)) + err = -EFBIG; + } + kfree(seq); + out: + si_read_unlock(sb); + AuTraceErr(err); + return err; +} + +/* ---------------------------------------------------------------------- */ + +void sysaufs_br_init(struct au_branch *br) +{ + br->br_attr.name = br->br_name; + br->br_attr.mode = S_IRUGO; + br->br_attr.owner = THIS_MODULE; +} + +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) +{ + struct au_sbinfo *sbinfo; + aufs_bindex_t bend; + + LKTRTrace("b%d\n", bindex); + + if (!sysaufs_brs) + return; + + sbinfo = au_sbi(sb); + bend = au_sbend(sb); + for (; bindex <= bend; bindex++) + sysfs_remove_file(&sbinfo->si_kobj, + &au_sbr(sb, bindex)->br_attr); +} + +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex) +{ + int err; + struct kobject *kobj; + aufs_bindex_t bend; + struct au_branch *br; + + LKTRTrace("b%d\n", bindex); + + if (!sysaufs_brs) + return; + + kobj = &au_sbi(sb)->si_kobj; + bend = au_sbend(sb); + for (; bindex <= bend; bindex++) { + br = au_sbr(sb, bindex); + snprintf(br->br_name, sizeof(br->br_name), + SysaufsBr_PREFIX "%d", bindex); + err = sysfs_create_file(kobj, &br->br_attr); + if (unlikely(err)) + AuWarn("failed %s under sysfs(%d)\n", br->br_name, err); + } +} -- 1.4.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html