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-rw-r--r--fs/gfs2/ops_fstype.c135
-rw-r--r--fs/gfs2/super.c16
-rw-r--r--fs/gfs2/super.h2
3 files changed, 127 insertions, 26 deletions
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 52fb6c048981..e5ee06231ae5 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1114,7 +1114,7 @@ void gfs2_online_uevent(struct gfs2_sbd *sdp)
* Returns: errno
*/
-static int fill_super(struct super_block *sb, void *data, int silent)
+static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
{
struct gfs2_sbd *sdp;
struct gfs2_holder mount_gh;
@@ -1125,17 +1125,7 @@ static int fill_super(struct super_block *sb, void *data, int silent)
printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
return -ENOMEM;
}
-
- sdp->sd_args.ar_quota = GFS2_QUOTA_DEFAULT;
- sdp->sd_args.ar_data = GFS2_DATA_DEFAULT;
- sdp->sd_args.ar_commit = 60;
- sdp->sd_args.ar_errors = GFS2_ERRORS_DEFAULT;
-
- error = gfs2_mount_args(sdp, &sdp->sd_args, data);
- if (error) {
- printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
- goto fail;
- }
+ sdp->sd_args = *args;
if (sdp->sd_args.ar_spectator) {
sb->s_flags |= MS_RDONLY;
@@ -1243,18 +1233,125 @@ fail:
return error;
}
-static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data, struct vfsmount *mnt)
+static int set_gfs2_super(struct super_block *s, void *data)
{
- return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
+ s->s_bdev = data;
+ s->s_dev = s->s_bdev->bd_dev;
+
+ /*
+ * We set the bdi here to the queue backing, file systems can
+ * overwrite this in ->fill_super()
+ */
+ s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
+ return 0;
}
-static int test_meta_super(struct super_block *s, void *ptr)
+static int test_gfs2_super(struct super_block *s, void *ptr)
{
struct block_device *bdev = ptr;
return (bdev == s->s_bdev);
}
+/**
+ * gfs2_get_sb - Get the GFS2 superblock
+ * @fs_type: The GFS2 filesystem type
+ * @flags: Mount flags
+ * @dev_name: The name of the device
+ * @data: The mount arguments
+ * @mnt: The vfsmnt for this mount
+ *
+ * Q. Why not use get_sb_bdev() ?
+ * A. We need to select one of two root directories to mount, independent
+ * of whether this is the initial, or subsequent, mount of this sb
+ *
+ * Returns: 0 or -ve on error
+ */
+
+static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data, struct vfsmount *mnt)
+{
+ struct block_device *bdev;
+ struct super_block *s;
+ fmode_t mode = FMODE_READ;
+ int error;
+ struct gfs2_args args;
+ struct gfs2_sbd *sdp;
+
+ if (!(flags & MS_RDONLY))
+ mode |= FMODE_WRITE;
+
+ bdev = open_bdev_exclusive(dev_name, mode, fs_type);
+ if (IS_ERR(bdev))
+ return PTR_ERR(bdev);
+
+ /*
+ * once the super is inserted into the list by sget, s_umount
+ * will protect the lockfs code from trying to start a snapshot
+ * while we are mounting
+ */
+ mutex_lock(&bdev->bd_fsfreeze_mutex);
+ if (bdev->bd_fsfreeze_count > 0) {
+ mutex_unlock(&bdev->bd_fsfreeze_mutex);
+ error = -EBUSY;
+ goto error_bdev;
+ }
+ s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev);
+ mutex_unlock(&bdev->bd_fsfreeze_mutex);
+ error = PTR_ERR(s);
+ if (IS_ERR(s))
+ goto error_bdev;
+
+ memset(&args, 0, sizeof(args));
+ args.ar_quota = GFS2_QUOTA_DEFAULT;
+ args.ar_data = GFS2_DATA_DEFAULT;
+ args.ar_commit = 60;
+ args.ar_errors = GFS2_ERRORS_DEFAULT;
+
+ error = gfs2_mount_args(&args, data);
+ if (error) {
+ printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
+ if (s->s_root)
+ goto error_super;
+ deactivate_locked_super(s);
+ return error;
+ }
+
+ if (s->s_root) {
+ error = -EBUSY;
+ if ((flags ^ s->s_flags) & MS_RDONLY)
+ goto error_super;
+ close_bdev_exclusive(bdev, mode);
+ } else {
+ char b[BDEVNAME_SIZE];
+
+ s->s_flags = flags;
+ s->s_mode = mode;
+ strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
+ sb_set_blocksize(s, block_size(bdev));
+ error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
+ if (error) {
+ deactivate_locked_super(s);
+ return error;
+ }
+ s->s_flags |= MS_ACTIVE;
+ bdev->bd_super = s;
+ }
+
+ sdp = s->s_fs_info;
+ mnt->mnt_sb = s;
+ if (args.ar_meta)
+ mnt->mnt_root = dget(sdp->sd_master_dir);
+ else
+ mnt->mnt_root = dget(sdp->sd_root_dir);
+ return 0;
+
+error_super:
+ deactivate_locked_super(s);
+error_bdev:
+ close_bdev_exclusive(bdev, mode);
+ return error;
+}
+
static int set_meta_super(struct super_block *s, void *ptr)
{
return -EINVAL;
@@ -1274,13 +1371,17 @@ static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
dev_name, error);
return error;
}
- s = sget(&gfs2_fs_type, test_meta_super, set_meta_super,
+ s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super,
path.dentry->d_inode->i_sb->s_bdev);
path_put(&path);
if (IS_ERR(s)) {
printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
return PTR_ERR(s);
}
+ if ((flags ^ s->s_flags) & MS_RDONLY) {
+ deactivate_locked_super(s);
+ return -EBUSY;
+ }
sdp = s->s_fs_info;
mnt->mnt_sb = s;
mnt->mnt_root = dget(sdp->sd_master_dir);
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 0ec3ec672de1..42e5458703f0 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -106,13 +106,13 @@ static const match_table_t tokens = {
/**
* gfs2_mount_args - Parse mount options
- * @sdp:
- * @data:
+ * @args: The structure into which the parsed options will be written
+ * @options: The options to parse
*
* Return: errno
*/
-int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *options)
+int gfs2_mount_args(struct gfs2_args *args, char *options)
{
char *o;
int token;
@@ -157,7 +157,7 @@ int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *options)
break;
case Opt_debug:
if (args->ar_errors == GFS2_ERRORS_PANIC) {
- fs_info(sdp, "-o debug and -o errors=panic "
+ printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
"are mutually exclusive.\n");
return -EINVAL;
}
@@ -210,7 +210,7 @@ int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *options)
case Opt_commit:
rv = match_int(&tmp[0], &args->ar_commit);
if (rv || args->ar_commit <= 0) {
- fs_info(sdp, "commit mount option requires a positive numeric argument\n");
+ printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
return rv ? rv : -EINVAL;
}
break;
@@ -219,7 +219,7 @@ int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *options)
break;
case Opt_err_panic:
if (args->ar_debug) {
- fs_info(sdp, "-o debug and -o errors=panic "
+ printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
"are mutually exclusive.\n");
return -EINVAL;
}
@@ -227,7 +227,7 @@ int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *options)
break;
case Opt_error:
default:
- fs_info(sdp, "invalid mount option: %s\n", o);
+ printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
return -EINVAL;
}
}
@@ -1062,7 +1062,7 @@ static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
spin_lock(&gt->gt_spin);
args.ar_commit = gt->gt_log_flush_secs;
spin_unlock(&gt->gt_spin);
- error = gfs2_mount_args(sdp, &args, data);
+ error = gfs2_mount_args(&args, data);
if (error)
return error;
diff --git a/fs/gfs2/super.h b/fs/gfs2/super.h
index 235db3682885..ed962ea68c3a 100644
--- a/fs/gfs2/super.h
+++ b/fs/gfs2/super.h
@@ -27,7 +27,7 @@ static inline unsigned int gfs2_jindex_size(struct gfs2_sbd *sdp)
extern void gfs2_jindex_free(struct gfs2_sbd *sdp);
-extern int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *data);
+extern int gfs2_mount_args(struct gfs2_args *args, char *data);
extern struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid);
extern int gfs2_jdesc_check(struct gfs2_jdesc *jd);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-14 21:44:39 +0300