#include <linux/writeback.h>
#include <linux/kobject.h>
#include <linux/exportfs.h>
+#include <linux/seq_file.h>
+#include <linux/mount.h>
#include "nilfs.h"
#include "mdt.h"
#include "alloc.h"
"(NILFS)");
MODULE_LICENSE("GPL");
-static void nilfs_write_super(struct super_block *sb);
static int nilfs_remount(struct super_block *sb, int *flags, char *data);
/**
if (!(sb->s_flags & MS_RDONLY)) {
struct the_nilfs *nilfs = sbi->s_nilfs;
- if (!nilfs_test_opt(sbi, ERRORS_CONT))
- nilfs_detach_segment_constructor(sbi);
-
down_write(&nilfs->ns_sem);
if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
nilfs->ns_mount_state |= NILFS_ERROR_FS;
static struct kmem_cache *nilfs_inode_cachep;
-struct inode *nilfs_alloc_inode(struct super_block *sb)
+struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs)
{
struct nilfs_inode_info *ii;
ii->i_bh = NULL;
ii->i_state = 0;
ii->vfs_inode.i_version = 1;
- nilfs_btnode_cache_init(&ii->i_btnode_cache);
+ nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi);
return &ii->vfs_inode;
}
+struct inode *nilfs_alloc_inode(struct super_block *sb)
+{
+ return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs);
+}
+
void nilfs_destroy_inode(struct inode *inode)
{
kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
{
struct nilfs_inode_info *ii = NILFS_I(inode);
-#ifdef CONFIG_NILFS_POSIX_ACL
- if (ii->i_acl && ii->i_acl != NILFS_ACL_NOT_CACHED) {
- posix_acl_release(ii->i_acl);
- ii->i_acl = NILFS_ACL_NOT_CACHED;
- }
- if (ii->i_default_acl && ii->i_default_acl != NILFS_ACL_NOT_CACHED) {
- posix_acl_release(ii->i_default_acl);
- ii->i_default_acl = NILFS_ACL_NOT_CACHED;
- }
-#endif
/*
* Free resources allocated in nilfs_read_inode(), here.
*/
memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
nilfs->ns_sbwtime[1] = t;
}
- sbi->s_super->s_dirt = 0;
+ clear_nilfs_sb_dirty(nilfs);
return nilfs_sync_super(sbi, dupsb);
}
lock_kernel();
- if (sb->s_dirt)
- nilfs_write_super(sb);
-
nilfs_detach_segment_constructor(sbi);
if (!(sb->s_flags & MS_RDONLY)) {
nilfs_commit_super(sbi, 1);
up_write(&nilfs->ns_sem);
}
- down_write(&nilfs->ns_sem);
+ down_write(&nilfs->ns_super_sem);
if (nilfs->ns_current == sbi)
nilfs->ns_current = NULL;
- up_write(&nilfs->ns_sem);
+ up_write(&nilfs->ns_super_sem);
nilfs_detach_checkpoint(sbi);
put_nilfs(sbi->s_nilfs);
sbi->s_super = NULL;
sb->s_fs_info = NULL;
- kfree(sbi);
+ nilfs_put_sbinfo(sbi);
unlock_kernel();
}
-/**
- * nilfs_write_super - write super block(s) of NILFS
- * @sb: super_block
- *
- * nilfs_write_super() gets a fs-dependent lock, writes super block(s), and
- * clears s_dirt. This function is called in the section protected by
- * lock_super().
- *
- * The s_dirt flag is managed by each filesystem and we protect it by ns_sem
- * of the struct the_nilfs. Lock order must be as follows:
- *
- * 1. lock_super()
- * 2. down_write(&nilfs->ns_sem)
- *
- * Inside NILFS, locking ns_sem is enough to protect s_dirt and the buffer
- * of the super block (nilfs->ns_sbp[]).
- *
- * In most cases, VFS functions call lock_super() before calling these
- * methods. So we must be careful not to bring on deadlocks when using
- * lock_super(); see generic_shutdown_super(), write_super(), and so on.
- *
- * Note that order of lock_kernel() and lock_super() depends on contexts
- * of VFS. We should also note that lock_kernel() can be used in its
- * protective section and only the outermost one has an effect.
- */
-static void nilfs_write_super(struct super_block *sb)
+static int nilfs_sync_fs(struct super_block *sb, int wait)
{
struct nilfs_sb_info *sbi = NILFS_SB(sb);
struct the_nilfs *nilfs = sbi->s_nilfs;
-
- down_write(&nilfs->ns_sem);
- if (!(sb->s_flags & MS_RDONLY)) {
- struct nilfs_super_block **sbp = nilfs->ns_sbp;
- u64 t = get_seconds();
- int dupsb;
-
- if (!nilfs_discontinued(nilfs) && t >= nilfs->ns_sbwtime[0] &&
- t < nilfs->ns_sbwtime[0] + NILFS_SB_FREQ) {
- up_write(&nilfs->ns_sem);
- return;
- }
- dupsb = sbp[1] && t > nilfs->ns_sbwtime[1] + NILFS_ALTSB_FREQ;
- nilfs_commit_super(sbi, dupsb);
- }
- sb->s_dirt = 0;
- up_write(&nilfs->ns_sem);
-}
-
-static int nilfs_sync_fs(struct super_block *sb, int wait)
-{
int err = 0;
- nilfs_write_super(sb);
-
/* This function is called when super block should be written back */
if (wait)
err = nilfs_construct_segment(sb);
+
+ down_write(&nilfs->ns_sem);
+ if (nilfs_sb_dirty(nilfs))
+ nilfs_commit_super(sbi, 1);
+ up_write(&nilfs->ns_sem);
+
return err;
}
struct buffer_head *bh_cp;
int err;
- down_write(&nilfs->ns_sem);
+ down_write(&nilfs->ns_super_sem);
list_add(&sbi->s_list, &nilfs->ns_supers);
- up_write(&nilfs->ns_sem);
+ up_write(&nilfs->ns_super_sem);
- sbi->s_ifile = nilfs_mdt_new(
- nilfs, sbi->s_super, NILFS_IFILE_INO, NILFS_IFILE_GFP);
+ sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size);
if (!sbi->s_ifile)
return -ENOMEM;
- err = nilfs_palloc_init_blockgroup(sbi->s_ifile, nilfs->ns_inode_size);
- if (unlikely(err))
- goto failed;
-
+ down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
&bh_cp);
+ up_read(&nilfs->ns_segctor_sem);
if (unlikely(err)) {
if (err == -ENOENT || err == -EINVAL) {
printk(KERN_ERR
nilfs_mdt_destroy(sbi->s_ifile);
sbi->s_ifile = NULL;
- down_write(&nilfs->ns_sem);
+ down_write(&nilfs->ns_super_sem);
list_del_init(&sbi->s_list);
- up_write(&nilfs->ns_sem);
+ up_write(&nilfs->ns_super_sem);
return err;
}
{
struct the_nilfs *nilfs = sbi->s_nilfs;
- nilfs_mdt_clear(sbi->s_ifile);
nilfs_mdt_destroy(sbi->s_ifile);
sbi->s_ifile = NULL;
- down_write(&nilfs->ns_sem);
+ down_write(&nilfs->ns_super_sem);
list_del_init(&sbi->s_list);
- up_write(&nilfs->ns_sem);
-}
-
-static int nilfs_mark_recovery_complete(struct nilfs_sb_info *sbi)
-{
- struct the_nilfs *nilfs = sbi->s_nilfs;
- int err = 0;
-
- down_write(&nilfs->ns_sem);
- if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) {
- nilfs->ns_mount_state |= NILFS_VALID_FS;
- err = nilfs_commit_super(sbi, 1);
- if (likely(!err))
- printk(KERN_INFO "NILFS: recovery complete.\n");
- }
- up_write(&nilfs->ns_sem);
- return err;
+ up_write(&nilfs->ns_super_sem);
}
static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
/*
* Compute the overhead
*
- * When distributing meta data blocks outside semgent structure,
+ * When distributing meta data blocks outside segment structure,
* We must count them as the overhead.
*/
overhead = 0;
return 0;
}
-static struct super_operations nilfs_sops = {
+static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
+{
+ struct super_block *sb = vfs->mnt_sb;
+ struct nilfs_sb_info *sbi = NILFS_SB(sb);
+
+ if (!nilfs_test_opt(sbi, BARRIER))
+ seq_printf(seq, ",nobarrier");
+ if (nilfs_test_opt(sbi, SNAPSHOT))
+ seq_printf(seq, ",cp=%llu",
+ (unsigned long long int)sbi->s_snapshot_cno);
+ if (nilfs_test_opt(sbi, ERRORS_RO))
+ seq_printf(seq, ",errors=remount-ro");
+ if (nilfs_test_opt(sbi, ERRORS_PANIC))
+ seq_printf(seq, ",errors=panic");
+ if (nilfs_test_opt(sbi, STRICT_ORDER))
+ seq_printf(seq, ",order=strict");
+ if (nilfs_test_opt(sbi, NORECOVERY))
+ seq_printf(seq, ",norecovery");
+ if (nilfs_test_opt(sbi, DISCARD))
+ seq_printf(seq, ",discard");
+
+ return 0;
+}
+
+static const struct super_operations nilfs_sops = {
.alloc_inode = nilfs_alloc_inode,
.destroy_inode = nilfs_destroy_inode,
.dirty_inode = nilfs_dirty_inode,
/* .drop_inode = nilfs_drop_inode, */
.delete_inode = nilfs_delete_inode,
.put_super = nilfs_put_super,
- .write_super = nilfs_write_super,
+ /* .write_super = nilfs_write_super, */
.sync_fs = nilfs_sync_fs,
/* .write_super_lockfs */
/* .unlockfs */
.remount_fs = nilfs_remount,
.clear_inode = nilfs_clear_inode,
/* .umount_begin */
- /* .show_options */
+ .show_options = nilfs_show_options
};
static struct inode *
nilfs_nfs_get_inode);
}
-static struct export_operations nilfs_export_ops = {
+static const struct export_operations nilfs_export_ops = {
.fh_to_dentry = nilfs_fh_to_dentry,
.fh_to_parent = nilfs_fh_to_parent,
.get_parent = nilfs_get_parent,
enum {
Opt_err_cont, Opt_err_panic, Opt_err_ro,
- Opt_barrier, Opt_snapshot, Opt_order,
- Opt_err,
+ Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
+ Opt_discard, Opt_err,
};
static match_table_t tokens = {
{Opt_err_cont, "errors=continue"},
{Opt_err_panic, "errors=panic"},
{Opt_err_ro, "errors=remount-ro"},
- {Opt_barrier, "barrier=%s"},
+ {Opt_nobarrier, "nobarrier"},
{Opt_snapshot, "cp=%u"},
{Opt_order, "order=%s"},
+ {Opt_norecovery, "norecovery"},
+ {Opt_discard, "discard"},
{Opt_err, NULL}
};
-static int match_bool(substring_t *s, int *result)
-{
- int len = s->to - s->from;
-
- if (strncmp(s->from, "on", len) == 0)
- *result = 1;
- else if (strncmp(s->from, "off", len) == 0)
- *result = 0;
- else
- return 1;
- return 0;
-}
-
static int parse_options(char *options, struct super_block *sb)
{
struct nilfs_sb_info *sbi = NILFS_SB(sb);
token = match_token(p, tokens, args);
switch (token) {
- case Opt_barrier:
- if (match_bool(&args[0], &option))
- return 0;
- if (option)
- nilfs_set_opt(sbi, BARRIER);
- else
- nilfs_clear_opt(sbi, BARRIER);
+ case Opt_nobarrier:
+ nilfs_clear_opt(sbi, BARRIER);
break;
case Opt_order:
if (strcmp(args[0].from, "relaxed") == 0)
sbi->s_snapshot_cno = option;
nilfs_set_opt(sbi, SNAPSHOT);
break;
+ case Opt_norecovery:
+ nilfs_set_opt(sbi, NORECOVERY);
+ break;
+ case Opt_discard:
+ nilfs_set_opt(sbi, DISCARD);
+ break;
default:
printk(KERN_ERR
"NILFS: Unrecognized mount option \"%s\"\n", p);
int mnt_count = le16_to_cpu(sbp->s_mnt_count);
/* nilfs->sem must be locked by the caller. */
- if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) {
- printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n");
- } else if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
+ if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
printk(KERN_WARNING
"NILFS warning: mounting fs with errors\n");
#if 0
* @silent: silent mode flag
* @nilfs: the_nilfs struct
*
- * This function is called exclusively by bd_mount_mutex.
+ * This function is called exclusively by nilfs->ns_mount_mutex.
* So, the recovery process is protected from other simultaneous mounts.
*/
static int
get_nilfs(nilfs);
sbi->s_nilfs = nilfs;
sbi->s_super = sb;
+ atomic_set(&sbi->s_count, 1);
err = init_nilfs(nilfs, sbi, (char *)data);
if (err)
sb->s_export_op = &nilfs_export_ops;
sb->s_root = NULL;
sb->s_time_gran = 1;
+ sb->s_bdi = nilfs->ns_bdi;
+
+ err = load_nilfs(nilfs, sbi);
+ if (err)
+ goto failed_sbi;
- if (!nilfs_loaded(nilfs)) {
- err = load_nilfs(nilfs, sbi);
- if (err)
- goto failed_sbi;
- }
cno = nilfs_last_cno(nilfs);
if (sb->s_flags & MS_RDONLY) {
if (nilfs_test_opt(sbi, SNAPSHOT)) {
+ down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,
sbi->s_snapshot_cno);
- if (err < 0)
+ up_read(&nilfs->ns_segctor_sem);
+ if (err < 0) {
+ if (err == -ENOENT)
+ err = -EINVAL;
goto failed_sbi;
+ }
if (!err) {
printk(KERN_ERR
"NILFS: The specified checkpoint is "
up_write(&nilfs->ns_sem);
}
- err = nilfs_mark_recovery_complete(sbi);
- if (unlikely(err)) {
- printk(KERN_ERR "NILFS: recovery failed.\n");
- goto failed_root;
- }
-
- down_write(&nilfs->ns_sem);
+ down_write(&nilfs->ns_super_sem);
if (!nilfs_test_opt(sbi, SNAPSHOT))
nilfs->ns_current = sbi;
- up_write(&nilfs->ns_sem);
+ up_write(&nilfs->ns_super_sem);
return 0;
- failed_root:
- dput(sb->s_root);
- sb->s_root = NULL;
-
failed_segctor:
nilfs_detach_segment_constructor(sbi);
failed_sbi:
put_nilfs(nilfs);
sb->s_fs_info = NULL;
- kfree(sbi);
+ nilfs_put_sbinfo(sbi);
return err;
}
lock_kernel();
+ down_write(&nilfs->ns_super_sem);
old_sb_flags = sb->s_flags;
old_opts.mount_opt = sbi->s_mount_opt;
old_opts.snapshot_cno = sbi->s_snapshot_cno;
if ((*flags & MS_RDONLY) &&
sbi->s_snapshot_cno != old_opts.snapshot_cno) {
printk(KERN_WARNING "NILFS (device %s): couldn't "
- "remount to a different snapshot. \n",
+ "remount to a different snapshot.\n",
sb->s_id);
err = -EINVAL;
goto restore_opts;
}
+ if (!nilfs_valid_fs(nilfs)) {
+ printk(KERN_WARNING "NILFS (device %s): couldn't "
+ "remount because the filesystem is in an "
+ "incomplete recovery state.\n", sb->s_id);
+ err = -EINVAL;
+ goto restore_opts;
+ }
+
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
goto out;
if (*flags & MS_RDONLY) {
* store the current valid flag. (It may have been changed
* by fsck since we originally mounted the partition.)
*/
- down(&sb->s_bdev->bd_mount_sem);
- down_read(&nilfs->ns_sem);
if (nilfs->ns_current && nilfs->ns_current != sbi) {
printk(KERN_WARNING "NILFS (device %s): couldn't "
"remount because an RW-mount exists.\n",
sb->s_id);
- up_read(&nilfs->ns_sem);
err = -EBUSY;
- goto rw_remount_failed;
+ goto restore_opts;
}
- up_read(&nilfs->ns_sem);
if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) {
printk(KERN_WARNING "NILFS (device %s): couldn't "
"remount because the current RO-mount is not "
"the latest one.\n",
sb->s_id);
err = -EINVAL;
- goto rw_remount_failed;
+ goto restore_opts;
}
sb->s_flags &= ~MS_RDONLY;
nilfs_clear_opt(sbi, SNAPSHOT);
err = nilfs_attach_segment_constructor(sbi);
if (err)
- goto rw_remount_failed;
+ goto restore_opts;
down_write(&nilfs->ns_sem);
nilfs_setup_super(sbi);
- nilfs->ns_current = sbi;
up_write(&nilfs->ns_sem);
- up(&sb->s_bdev->bd_mount_sem);
+ nilfs->ns_current = sbi;
}
out:
+ up_write(&nilfs->ns_super_sem);
unlock_kernel();
return 0;
- rw_remount_failed:
- up(&sb->s_bdev->bd_mount_sem);
restore_opts:
sb->s_flags = old_sb_flags;
sbi->s_mount_opt = old_opts.mount_opt;
sbi->s_snapshot_cno = old_opts.snapshot_cno;
+ up_write(&nilfs->ns_super_sem);
unlock_kernel();
return err;
}
struct nilfs_super_data {
struct block_device *bdev;
+ struct nilfs_sb_info *sbi;
__u64 cno;
int flags;
};
static int nilfs_test_bdev_super(struct super_block *s, void *data)
{
struct nilfs_super_data *sd = data;
- int ret;
-
- if (s->s_bdev != sd->bdev)
- return 0;
-
- if (!((s->s_flags | sd->flags) & MS_RDONLY))
- return 1; /* Reuse an old R/W-mode super_block */
-
- if (s->s_flags & sd->flags & MS_RDONLY) {
- if (down_read_trylock(&s->s_umount)) {
- ret = s->s_root &&
- (sd->cno == NILFS_SB(s)->s_snapshot_cno);
- up_read(&s->s_umount);
- /*
- * This path is locked with sb_lock by sget().
- * So, drop_super() causes deadlock.
- */
- return ret;
- }
- }
- return 0;
+
+ return sd->sbi && s->s_fs_info == (void *)sd->sbi;
}
static int
* much more information than normal filesystems to identify mount
* instance. For snapshot mounts, not only a mount type (ro-mount
* or rw-mount) but also a checkpoint number is required.
- * The results are passed in sget() using nilfs_super_data.
*/
sd.cno = 0;
sd.flags = flags;
goto failed;
}
- down(&sd.bdev->bd_mount_sem);
+ mutex_lock(&nilfs->ns_mount_mutex);
if (!sd.cno) {
/*
* (i.e. rw-mount or ro-mount), whereas rw-mount and
* ro-mount are mutually exclusive.
*/
- down_read(&nilfs->ns_sem);
+ down_read(&nilfs->ns_super_sem);
if (nilfs->ns_current &&
((nilfs->ns_current->s_super->s_flags ^ flags)
& MS_RDONLY)) {
- up_read(&nilfs->ns_sem);
+ up_read(&nilfs->ns_super_sem);
err = -EBUSY;
goto failed_unlock;
}
- up_read(&nilfs->ns_sem);
+ up_read(&nilfs->ns_super_sem);
}
/*
- * Search specified snapshot or R/W mode super_block
+ * Find existing nilfs_sb_info struct
*/
- if (!sd.cno)
- /* trying to get the latest checkpoint. */
- sd.cno = nilfs_last_cno(nilfs);
+ sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno);
+ /*
+ * Get super block instance holding the nilfs_sb_info struct.
+ * A new instance is allocated if no existing mount is present or
+ * existing instance has been unmounted.
+ */
s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd);
+ if (sd.sbi)
+ nilfs_put_sbinfo(sd.sbi);
+
if (IS_ERR(s)) {
err = PTR_ERR(s);
goto failed_unlock;
need_to_close = 0;
}
- up(&sd.bdev->bd_mount_sem);
+ mutex_unlock(&nilfs->ns_mount_mutex);
put_nilfs(nilfs);
if (need_to_close)
close_bdev_exclusive(sd.bdev, flags);
return 0;
failed_unlock:
- up(&sd.bdev->bd_mount_sem);
+ mutex_unlock(&nilfs->ns_mount_mutex);
put_nilfs(nilfs);
failed:
close_bdev_exclusive(sd.bdev, flags);
cancel_new:
/* Abandoning the newly allocated superblock */
- up(&sd.bdev->bd_mount_sem);
+ mutex_unlock(&nilfs->ns_mount_mutex);
put_nilfs(nilfs);
- up_write(&s->s_umount);
- deactivate_super(s);
+ deactivate_locked_super(s);
/*
* deactivate_super() invokes close_bdev_exclusive().
* We must finish all post-cleaning before this call;
- * put_nilfs() and unlocking bd_mount_sem need the block device.
+ * put_nilfs() needs the block device.
*/
return err;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff