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Diffstat (limited to 'fs/ext2/super.c')
-rw-r--r--fs/ext2/super.c99
1 files changed, 41 insertions, 58 deletions
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 42e4a303b675..71e9eb1fa696 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -26,7 +26,6 @@
#include <linux/random.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
-#include <linux/smp_lock.h>
#include <linux/vfs.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
@@ -39,7 +38,7 @@
#include "xip.h"
static void ext2_sync_super(struct super_block *sb,
- struct ext2_super_block *es);
+ struct ext2_super_block *es, int wait);
static int ext2_remount (struct super_block * sb, int * flags, char * data);
static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
static int ext2_sync_fs(struct super_block *sb, int wait);
@@ -52,9 +51,11 @@ void ext2_error (struct super_block * sb, const char * function,
struct ext2_super_block *es = sbi->s_es;
if (!(sb->s_flags & MS_RDONLY)) {
+ spin_lock(&sbi->s_lock);
sbi->s_mount_state |= EXT2_ERROR_FS;
es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
- ext2_sync_super(sb, es);
+ spin_unlock(&sbi->s_lock);
+ ext2_sync_super(sb, es, 1);
}
va_start(args, fmt);
@@ -84,6 +85,9 @@ void ext2_msg(struct super_block *sb, const char *prefix,
va_end(args);
}
+/*
+ * This must be called with sbi->s_lock held.
+ */
void ext2_update_dynamic_rev(struct super_block *sb)
{
struct ext2_super_block *es = EXT2_SB(sb)->s_es;
@@ -115,8 +119,6 @@ static void ext2_put_super (struct super_block * sb)
int i;
struct ext2_sb_info *sbi = EXT2_SB(sb);
- lock_kernel();
-
if (sb->s_dirt)
ext2_write_super(sb);
@@ -124,8 +126,10 @@ static void ext2_put_super (struct super_block * sb)
if (!(sb->s_flags & MS_RDONLY)) {
struct ext2_super_block *es = sbi->s_es;
+ spin_lock(&sbi->s_lock);
es->s_state = cpu_to_le16(sbi->s_mount_state);
- ext2_sync_super(sb, es);
+ spin_unlock(&sbi->s_lock);
+ ext2_sync_super(sb, es, 1);
}
db_count = sbi->s_gdb_count;
for (i = 0; i < db_count; i++)
@@ -140,8 +144,6 @@ static void ext2_put_super (struct super_block * sb)
sb->s_fs_info = NULL;
kfree(sbi->s_blockgroup_lock);
kfree(sbi);
-
- unlock_kernel();
}
static struct kmem_cache * ext2_inode_cachep;
@@ -209,6 +211,7 @@ static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
struct ext2_super_block *es = sbi->s_es;
unsigned long def_mount_opts;
+ spin_lock(&sbi->s_lock);
def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
if (sbi->s_sb_block != 1)
@@ -281,6 +284,7 @@ static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
if (!test_opt(sb, RESERVATION))
seq_puts(seq, ",noreservation");
+ spin_unlock(&sbi->s_lock);
return 0;
}
@@ -606,7 +610,6 @@ static int ext2_setup_super (struct super_block * sb,
if (!le16_to_cpu(es->s_max_mnt_count))
es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
le16_add_cpu(&es->s_mnt_count, 1);
- ext2_write_super(sb);
if (test_opt (sb, DEBUG))
ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, "
"bpg=%lu, ipg=%lu, mo=%04lx]",
@@ -767,6 +770,8 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
sb->s_fs_info = sbi;
sbi->s_sb_block = sb_block;
+ spin_lock_init(&sbi->s_lock);
+
/*
* See what the current blocksize for the device is, and
* use that as the blocksize. Otherwise (or if the blocksize
@@ -1079,7 +1084,9 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
ext2_msg(sb, KERN_WARNING,
"warning: mounting ext3 filesystem as ext2");
- ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
+ if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY))
+ sb->s_flags |= MS_RDONLY;
+ ext2_write_super(sb);
return 0;
cantfind_ext2:
@@ -1120,30 +1127,26 @@ static void ext2_clear_super_error(struct super_block *sb)
* be remapped. Nothing we can do but to retry the
* write and hope for the best.
*/
- printk(KERN_ERR "EXT2-fs: %s previous I/O error to "
- "superblock detected", sb->s_id);
+ ext2_msg(sb, KERN_ERR,
+ "previous I/O error to superblock detected\n");
clear_buffer_write_io_error(sbh);
set_buffer_uptodate(sbh);
}
}
-static void ext2_commit_super (struct super_block * sb,
- struct ext2_super_block * es)
-{
- ext2_clear_super_error(sb);
- es->s_wtime = cpu_to_le32(get_seconds());
- mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
- sb->s_dirt = 0;
-}
-
-static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
+static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
+ int wait)
{
ext2_clear_super_error(sb);
+ spin_lock(&EXT2_SB(sb)->s_lock);
es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
es->s_wtime = cpu_to_le32(get_seconds());
+ /* unlock before we do IO */
+ spin_unlock(&EXT2_SB(sb)->s_lock);
mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
- sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
+ if (wait)
+ sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
sb->s_dirt = 0;
}
@@ -1157,43 +1160,18 @@ static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
* may have been checked while mounted and e2fsck may have
* set s_state to EXT2_VALID_FS after some corrections.
*/
-
static int ext2_sync_fs(struct super_block *sb, int wait)
{
+ struct ext2_sb_info *sbi = EXT2_SB(sb);
struct ext2_super_block *es = EXT2_SB(sb)->s_es;
- struct buffer_head *sbh = EXT2_SB(sb)->s_sbh;
-
- lock_kernel();
- if (buffer_write_io_error(sbh)) {
- /*
- * Oh, dear. A previous attempt to write the
- * superblock failed. This could happen because the
- * USB device was yanked out. Or it could happen to
- * be a transient write error and maybe the block will
- * be remapped. Nothing we can do but to retry the
- * write and hope for the best.
- */
- ext2_msg(sb, KERN_ERR,
- "previous I/O error to superblock detected\n");
- clear_buffer_write_io_error(sbh);
- set_buffer_uptodate(sbh);
- }
+ spin_lock(&sbi->s_lock);
if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
ext2_debug("setting valid to 0\n");
es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
- es->s_free_blocks_count =
- cpu_to_le32(ext2_count_free_blocks(sb));
- es->s_free_inodes_count =
- cpu_to_le32(ext2_count_free_inodes(sb));
- es->s_mtime = cpu_to_le32(get_seconds());
- ext2_sync_super(sb, es);
- } else {
- ext2_commit_super(sb, es);
}
- sb->s_dirt = 0;
- unlock_kernel();
-
+ spin_unlock(&sbi->s_lock);
+ ext2_sync_super(sb, es, wait);
return 0;
}
@@ -1215,7 +1193,7 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
unsigned long old_sb_flags;
int err;
- lock_kernel();
+ spin_lock(&sbi->s_lock);
/* Store the old options */
old_sb_flags = sb->s_flags;
@@ -1254,13 +1232,13 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP;
}
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
- unlock_kernel();
+ spin_unlock(&sbi->s_lock);
return 0;
}
if (*flags & MS_RDONLY) {
if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
!(sbi->s_mount_state & EXT2_VALID_FS)) {
- unlock_kernel();
+ spin_unlock(&sbi->s_lock);
return 0;
}
/*
@@ -1269,6 +1247,8 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
*/
es->s_state = cpu_to_le16(sbi->s_mount_state);
es->s_mtime = cpu_to_le32(get_seconds());
+ spin_unlock(&sbi->s_lock);
+ ext2_sync_super(sb, es, 1);
} else {
__le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
~EXT2_FEATURE_RO_COMPAT_SUPP);
@@ -1288,16 +1268,16 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
sbi->s_mount_state = le16_to_cpu(es->s_state);
if (!ext2_setup_super (sb, es, 0))
sb->s_flags &= ~MS_RDONLY;
+ spin_unlock(&sbi->s_lock);
+ ext2_write_super(sb);
}
- ext2_sync_super(sb, es);
- unlock_kernel();
return 0;
restore_opts:
sbi->s_mount_opt = old_opts.s_mount_opt;
sbi->s_resuid = old_opts.s_resuid;
sbi->s_resgid = old_opts.s_resgid;
sb->s_flags = old_sb_flags;
- unlock_kernel();
+ spin_unlock(&sbi->s_lock);
return err;
}
@@ -1308,6 +1288,8 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
struct ext2_super_block *es = sbi->s_es;
u64 fsid;
+ spin_lock(&sbi->s_lock);
+
if (test_opt (sb, MINIX_DF))
sbi->s_overhead_last = 0;
else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
@@ -1362,6 +1344,7 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
le64_to_cpup((void *)es->s_uuid + sizeof(u64));
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
+ spin_unlock(&sbi->s_lock);
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 12:30:10 +0000