diff options
Diffstat (limited to 'fs/nilfs2/super.c')
| -rw-r--r-- | fs/nilfs2/super.c | 104 |
1 files changed, 40 insertions, 64 deletions
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 151964f0de4..644e66727dd 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -50,6 +50,8 @@ #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" @@ -65,7 +67,6 @@ MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " "(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); /** @@ -311,9 +312,6 @@ static void nilfs_put_super(struct super_block *sb) lock_kernel(); - if (sb->s_dirt) - nilfs_write_super(sb); - nilfs_detach_segment_constructor(sbi); if (!(sb->s_flags & MS_RDONLY)) { @@ -336,63 +334,21 @@ static void nilfs_put_super(struct super_block *sb) 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 (sb->s_dirt) + nilfs_commit_super(sbi, 1); + up_write(&nilfs->ns_sem); + return err; } @@ -407,8 +363,7 @@ int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) list_add(&sbi->s_list, &nilfs->ns_supers); 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_mdt_new(nilfs, sbi->s_super, NILFS_IFILE_INO); if (!sbi->s_ifile) return -ENOMEM; @@ -529,7 +484,27 @@ static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) 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, ",barrier=off"); + 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"); + + return 0; +} + +static const struct super_operations nilfs_sops = { .alloc_inode = nilfs_alloc_inode, .destroy_inode = nilfs_destroy_inode, .dirty_inode = nilfs_dirty_inode, @@ -538,7 +513,7 @@ static struct super_operations nilfs_sops = { /* .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 */ @@ -546,7 +521,7 @@ static struct super_operations nilfs_sops = { .remount_fs = nilfs_remount, .clear_inode = nilfs_clear_inode, /* .umount_begin */ - /* .show_options */ + .show_options = nilfs_show_options }; static struct inode * @@ -585,7 +560,7 @@ nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, 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, @@ -816,10 +791,15 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, 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 " @@ -1127,10 +1107,6 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, */ sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); - if (!sd.cno) - /* trying to get the latest checkpoint. */ - sd.cno = nilfs_last_cno(nilfs); - /* * Get super block instance holding the nilfs_sb_info struct. * A new instance is allocated if no existing mount is present or |