#include <linux/slab.h>
#include <linux/major.h>
#include <linux/backing-dev.h>
+#include <linux/fs_context.h>
+#include "mtdcore.h"
/*
* compare superblocks to see if they're equivalent
* - they are if the underlying MTD device is the same
*/
-static int get_sb_mtd_compare(struct super_block *sb, void *_mtd)
+static int mtd_test_super(struct super_block *sb, struct fs_context *fc)
{
- struct mtd_info *mtd = _mtd;
+ struct mtd_info *mtd = fc->sget_key;
- if (sb->s_mtd == mtd) {
+ if (sb->s_mtd == fc->sget_key) {
pr_debug("MTDSB: Match on device %d (\"%s\")\n",
- mtd->index, mtd->name);
+ mtd->index, mtd->name);
return 1;
}
pr_debug("MTDSB: No match, device %d (\"%s\"), device %d (\"%s\")\n",
- sb->s_mtd->index, sb->s_mtd->name, mtd->index, mtd->name);
+ sb->s_mtd->index, sb->s_mtd->name, mtd->index, mtd->name);
return 0;
}
-extern struct backing_dev_info *mtd_bdi;
-
/*
* mark the superblock by the MTD device it is using
* - set the device number to be the correct MTD block device for pesuperstence
* of NFS exports
*/
-static int get_sb_mtd_set(struct super_block *sb, void *_mtd)
+static int mtd_set_super(struct super_block *sb, struct fs_context *fc)
{
- struct mtd_info *mtd = _mtd;
-
- sb->s_mtd = mtd;
- sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, mtd->index);
+ sb->s_mtd = fc->sget_key;
+ sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, sb->s_mtd->index);
sb->s_bdi = bdi_get(mtd_bdi);
-
return 0;
}
/*
* get a superblock on an MTD-backed filesystem
*/
-static struct dentry *mount_mtd_aux(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data,
- struct mtd_info *mtd,
- int (*fill_super)(struct super_block *, void *, int))
+static int mtd_get_sb(struct fs_context *fc,
+ struct mtd_info *mtd,
+ int (*fill_super)(struct super_block *,
+ struct fs_context *))
{
struct super_block *sb;
int ret;
- sb = sget(fs_type, get_sb_mtd_compare, get_sb_mtd_set, flags, mtd);
+ fc->sget_key = mtd;
+ sb = sget_fc(fc, mtd_test_super, mtd_set_super);
if (IS_ERR(sb))
- goto out_error;
-
- if (sb->s_root)
- goto already_mounted;
-
- /* fresh new superblock */
- pr_debug("MTDSB: New superblock for device %d (\"%s\")\n",
- mtd->index, mtd->name);
-
- ret = fill_super(sb, data, flags & SB_SILENT ? 1 : 0);
- if (ret < 0) {
- deactivate_locked_super(sb);
- return ERR_PTR(ret);
+ return PTR_ERR(sb);
+
+ if (sb->s_root) {
+ /* new mountpoint for an already mounted superblock */
+ pr_debug("MTDSB: Device %d (\"%s\") is already mounted\n",
+ mtd->index, mtd->name);
+ put_mtd_device(mtd);
+ } else {
+ /* fresh new superblock */
+ pr_debug("MTDSB: New superblock for device %d (\"%s\")\n",
+ mtd->index, mtd->name);
+
+ ret = fill_super(sb, fc);
+ if (ret < 0)
+ goto error_sb;
+
+ sb->s_flags |= SB_ACTIVE;
}
- /* go */
- sb->s_flags |= SB_ACTIVE;
- return dget(sb->s_root);
-
- /* new mountpoint for an already mounted superblock */
-already_mounted:
- pr_debug("MTDSB: Device %d (\"%s\") is already mounted\n",
- mtd->index, mtd->name);
- put_mtd_device(mtd);
- return dget(sb->s_root);
+ BUG_ON(fc->root);
+ fc->root = dget(sb->s_root);
+ return 0;
-out_error:
- put_mtd_device(mtd);
- return ERR_CAST(sb);
+error_sb:
+ deactivate_locked_super(sb);
+ return ret;
}
/*
* get a superblock on an MTD-backed filesystem by MTD device number
*/
-static struct dentry *mount_mtd_nr(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data, int mtdnr,
- int (*fill_super)(struct super_block *, void *, int))
+static int mtd_get_sb_by_nr(struct fs_context *fc, int mtdnr,
+ int (*fill_super)(struct super_block *,
+ struct fs_context *))
{
struct mtd_info *mtd;
mtd = get_mtd_device(NULL, mtdnr);
if (IS_ERR(mtd)) {
- pr_debug("MTDSB: Device #%u doesn't appear to exist\n", mtdnr);
- return ERR_CAST(mtd);
+ errorf(fc, "MTDSB: Device #%u doesn't appear to exist\n", mtdnr);
+ return PTR_ERR(mtd);
}
- return mount_mtd_aux(fs_type, flags, dev_name, data, mtd, fill_super);
+ return mtd_get_sb(fc, mtd, fill_super);
}
-/*
- * set up an MTD-based superblock
+/**
+ * get_tree_mtd - Get a superblock based on a single MTD device
+ * @fc: The filesystem context holding the parameters
+ * @fill_super: Helper to initialise a new superblock
*/
-struct dentry *mount_mtd(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data,
- int (*fill_super)(struct super_block *, void *, int))
+int get_tree_mtd(struct fs_context *fc,
+ int (*fill_super)(struct super_block *sb,
+ struct fs_context *fc))
{
#ifdef CONFIG_BLOCK
struct block_device *bdev;
#endif
int mtdnr;
- if (!dev_name)
- return ERR_PTR(-EINVAL);
+ if (!fc->source)
+ return invalf(fc, "No source specified");
- pr_debug("MTDSB: dev_name \"%s\"\n", dev_name);
+ pr_debug("MTDSB: dev_name \"%s\"\n", fc->source);
/* the preferred way of mounting in future; especially when
* CONFIG_BLOCK=n - we specify the underlying MTD device by number or
* by name, so that we don't require block device support to be present
- * in the kernel. */
- if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
- if (dev_name[3] == ':') {
+ * in the kernel.
+ */
+ if (fc->source[0] == 'm' &&
+ fc->source[1] == 't' &&
+ fc->source[2] == 'd') {
+ if (fc->source[3] == ':') {
struct mtd_info *mtd;
/* mount by MTD device name */
pr_debug("MTDSB: mtd:%%s, name \"%s\"\n",
- dev_name + 4);
+ fc->source + 4);
- mtd = get_mtd_device_nm(dev_name + 4);
+ mtd = get_mtd_device_nm(fc->source + 4);
if (!IS_ERR(mtd))
- return mount_mtd_aux(
- fs_type, flags,
- dev_name, data, mtd,
- fill_super);
+ return mtd_get_sb(fc, mtd, fill_super);
- printk(KERN_NOTICE "MTD:"
- " MTD device with name \"%s\" not found.\n",
- dev_name + 4);
+ errorf(fc, "MTD: MTD device with name \"%s\" not found",
+ fc->source + 4);
- } else if (isdigit(dev_name[3])) {
+ } else if (isdigit(fc->source[3])) {
/* mount by MTD device number name */
char *endptr;
- mtdnr = simple_strtoul(dev_name + 3, &endptr, 0);
+ mtdnr = simple_strtoul(fc->source + 3, &endptr, 0);
if (!*endptr) {
/* It was a valid number */
- pr_debug("MTDSB: mtd%%d, mtdnr %d\n",
- mtdnr);
- return mount_mtd_nr(fs_type, flags,
- dev_name, data,
- mtdnr, fill_super);
+ pr_debug("MTDSB: mtd%%d, mtdnr %d\n", mtdnr);
+ return mtd_get_sb_by_nr(fc, mtdnr, fill_super);
}
}
}
/* try the old way - the hack where we allowed users to mount
* /dev/mtdblock$(n) but didn't actually _use_ the blockdev
*/
- bdev = lookup_bdev(dev_name);
+ bdev = lookup_bdev(fc->source);
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
- pr_debug("MTDSB: lookup_bdev() returned %d\n", ret);
- return ERR_PTR(ret);
+ errorf(fc, "MTD: Couldn't look up '%s': %d", fc->source, ret);
+ return ret;
}
pr_debug("MTDSB: lookup_bdev() returned 0\n");
- ret = -EINVAL;
-
major = MAJOR(bdev->bd_dev);
mtdnr = MINOR(bdev->bd_dev);
bdput(bdev);
- if (major != MTD_BLOCK_MAJOR)
- goto not_an_MTD_device;
-
- return mount_mtd_nr(fs_type, flags, dev_name, data, mtdnr, fill_super);
+ if (major == MTD_BLOCK_MAJOR)
+ return mtd_get_sb_by_nr(fc, mtdnr, fill_super);
-not_an_MTD_device:
#endif /* CONFIG_BLOCK */
- if (!(flags & SB_SILENT))
- printk(KERN_NOTICE
- "MTD: Attempt to mount non-MTD device \"%s\"\n",
- dev_name);
- return ERR_PTR(-EINVAL);
+ if (!(fc->sb_flags & SB_SILENT))
+ errorf(fc, "MTD: Attempt to mount non-MTD device \"%s\"",
+ fc->source);
+ return -EINVAL;
}
-
-EXPORT_SYMBOL_GPL(mount_mtd);
+EXPORT_SYMBOL_GPL(get_tree_mtd);
/*
* destroy an MTD-based superblock
projects / linux-2.6-microblaze.git / blobdiff