Merge branch 'work.mount-base' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs mount API infrastructure updates from Al Viro: "Infrastructure bits of mount API conversions. The rest is more of per-filesystem updates and that will happen in separate pull requests" * 'work.mount-base' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: mtd: Provide fs_context-aware mount_mtd() replacement vfs: Create fs_context-aware mount_bdev() replacement new helper: get_tree_keyed() vfs: set fs_context::user_ns for reconfigure
This commit is contained in:
commit
e170eb2771
|
@ -5,6 +5,7 @@
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*/
|
*/
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|
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extern struct mutex mtd_table_mutex;
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extern struct mutex mtd_table_mutex;
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extern struct backing_dev_info *mtd_bdi;
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|
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struct mtd_info *__mtd_next_device(int i);
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struct mtd_info *__mtd_next_device(int i);
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int __must_check add_mtd_device(struct mtd_info *mtd);
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int __must_check add_mtd_device(struct mtd_info *mtd);
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|
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@ -15,6 +15,183 @@
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#include <linux/slab.h>
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#include <linux/slab.h>
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#include <linux/major.h>
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#include <linux/major.h>
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#include <linux/backing-dev.h>
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#include <linux/backing-dev.h>
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#include <linux/fs_context.h>
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#include "mtdcore.h"
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|
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/*
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* compare superblocks to see if they're equivalent
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* - they are if the underlying MTD device is the same
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*/
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static int mtd_test_super(struct super_block *sb, struct fs_context *fc)
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{
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struct mtd_info *mtd = fc->sget_key;
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if (sb->s_mtd == fc->sget_key) {
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pr_debug("MTDSB: Match on device %d (\"%s\")\n",
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mtd->index, mtd->name);
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return 1;
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}
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|
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pr_debug("MTDSB: No match, device %d (\"%s\"), device %d (\"%s\")\n",
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sb->s_mtd->index, sb->s_mtd->name, mtd->index, mtd->name);
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return 0;
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}
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|
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/*
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* mark the superblock by the MTD device it is using
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* - set the device number to be the correct MTD block device for pesuperstence
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* of NFS exports
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*/
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static int mtd_set_super(struct super_block *sb, struct fs_context *fc)
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{
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sb->s_mtd = fc->sget_key;
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sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, sb->s_mtd->index);
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sb->s_bdi = bdi_get(mtd_bdi);
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return 0;
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}
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|
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/*
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* get a superblock on an MTD-backed filesystem
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*/
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static int mtd_get_sb(struct fs_context *fc,
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struct mtd_info *mtd,
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int (*fill_super)(struct super_block *,
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struct fs_context *))
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{
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struct super_block *sb;
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int ret;
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fc->sget_key = mtd;
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sb = sget_fc(fc, mtd_test_super, mtd_set_super);
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if (IS_ERR(sb))
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return PTR_ERR(sb);
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if (sb->s_root) {
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/* new mountpoint for an already mounted superblock */
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pr_debug("MTDSB: Device %d (\"%s\") is already mounted\n",
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mtd->index, mtd->name);
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put_mtd_device(mtd);
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} else {
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/* fresh new superblock */
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pr_debug("MTDSB: New superblock for device %d (\"%s\")\n",
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mtd->index, mtd->name);
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ret = fill_super(sb, fc);
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|
if (ret < 0)
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goto error_sb;
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sb->s_flags |= SB_ACTIVE;
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|
}
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|
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BUG_ON(fc->root);
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fc->root = dget(sb->s_root);
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|
return 0;
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|
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|
error_sb:
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|
deactivate_locked_super(sb);
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|
return ret;
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|
}
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|
|
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|
/*
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* get a superblock on an MTD-backed filesystem by MTD device number
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|
*/
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static int mtd_get_sb_by_nr(struct fs_context *fc, int mtdnr,
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int (*fill_super)(struct super_block *,
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|
struct fs_context *))
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|
{
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|
struct mtd_info *mtd;
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|
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|
mtd = get_mtd_device(NULL, mtdnr);
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|
if (IS_ERR(mtd)) {
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|
errorf(fc, "MTDSB: Device #%u doesn't appear to exist\n", mtdnr);
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|
return PTR_ERR(mtd);
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|
}
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|
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||||||
|
return mtd_get_sb(fc, mtd, fill_super);
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|
}
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|
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|
/**
|
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|
* get_tree_mtd - Get a superblock based on a single MTD device
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|
* @fc: The filesystem context holding the parameters
|
||||||
|
* @fill_super: Helper to initialise a new superblock
|
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|
*/
|
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|
int get_tree_mtd(struct fs_context *fc,
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|
int (*fill_super)(struct super_block *sb,
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|
struct fs_context *fc))
|
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|
{
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|
#ifdef CONFIG_BLOCK
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|
struct block_device *bdev;
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|
int ret, major;
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|
#endif
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|
int mtdnr;
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|
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|
if (!fc->source)
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|
return invalf(fc, "No source specified");
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|
|
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|
pr_debug("MTDSB: dev_name \"%s\"\n", fc->source);
|
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|
|
||||||
|
/* the preferred way of mounting in future; especially when
|
||||||
|
* CONFIG_BLOCK=n - we specify the underlying MTD device by number or
|
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|
* by name, so that we don't require block device support to be present
|
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|
* in the kernel.
|
||||||
|
*/
|
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|
if (fc->source[0] == 'm' &&
|
||||||
|
fc->source[1] == 't' &&
|
||||||
|
fc->source[2] == 'd') {
|
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|
if (fc->source[3] == ':') {
|
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|
struct mtd_info *mtd;
|
||||||
|
|
||||||
|
/* mount by MTD device name */
|
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|
pr_debug("MTDSB: mtd:%%s, name \"%s\"\n",
|
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|
fc->source + 4);
|
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|
|
||||||
|
mtd = get_mtd_device_nm(fc->source + 4);
|
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|
if (!IS_ERR(mtd))
|
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|
return mtd_get_sb(fc, mtd, fill_super);
|
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|
|
||||||
|
errorf(fc, "MTD: MTD device with name \"%s\" not found",
|
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|
fc->source + 4);
|
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|
|
||||||
|
} else if (isdigit(fc->source[3])) {
|
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|
/* mount by MTD device number name */
|
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|
char *endptr;
|
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|
|
||||||
|
mtdnr = simple_strtoul(fc->source + 3, &endptr, 0);
|
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|
if (!*endptr) {
|
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|
/* It was a valid number */
|
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|
pr_debug("MTDSB: mtd%%d, mtdnr %d\n", mtdnr);
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|
return mtd_get_sb_by_nr(fc, mtdnr, fill_super);
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|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#ifdef CONFIG_BLOCK
|
||||||
|
/* 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(fc->source);
|
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|
if (IS_ERR(bdev)) {
|
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|
ret = PTR_ERR(bdev);
|
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|
errorf(fc, "MTD: Couldn't look up '%s': %d", fc->source, ret);
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|
return ret;
|
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|
}
|
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|
pr_debug("MTDSB: lookup_bdev() returned 0\n");
|
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|
|
||||||
|
major = MAJOR(bdev->bd_dev);
|
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|
mtdnr = MINOR(bdev->bd_dev);
|
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|
bdput(bdev);
|
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|
|
||||||
|
if (major == MTD_BLOCK_MAJOR)
|
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|
return mtd_get_sb_by_nr(fc, mtdnr, fill_super);
|
||||||
|
|
||||||
|
#endif /* CONFIG_BLOCK */
|
||||||
|
|
||||||
|
if (!(fc->sb_flags & SB_SILENT))
|
||||||
|
errorf(fc, "MTD: Attempt to mount non-MTD device \"%s\"",
|
||||||
|
fc->source);
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(get_tree_mtd);
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* compare superblocks to see if they're equivalent
|
* compare superblocks to see if they're equivalent
|
||||||
|
@ -35,8 +212,6 @@ static int get_sb_mtd_compare(struct super_block *sb, void *_mtd)
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
extern struct backing_dev_info *mtd_bdi;
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* mark the superblock by the MTD device it is using
|
* mark the superblock by the MTD device it is using
|
||||||
* - set the device number to be the correct MTD block device for pesuperstence
|
* - set the device number to be the correct MTD block device for pesuperstence
|
||||||
|
|
|
@ -279,10 +279,8 @@ static struct fs_context *alloc_fs_context(struct file_system_type *fs_type,
|
||||||
fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);
|
fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);
|
||||||
break;
|
break;
|
||||||
case FS_CONTEXT_FOR_RECONFIGURE:
|
case FS_CONTEXT_FOR_RECONFIGURE:
|
||||||
/* We don't pin any namespaces as the superblock's
|
|
||||||
* subscriptions cannot be changed at this point.
|
|
||||||
*/
|
|
||||||
atomic_inc(&reference->d_sb->s_active);
|
atomic_inc(&reference->d_sb->s_active);
|
||||||
|
fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);
|
||||||
fc->root = dget(reference);
|
fc->root = dget(reference);
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
|
|
|
@ -1385,8 +1385,7 @@ static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
|
||||||
|
|
||||||
static int nfsd_fs_get_tree(struct fs_context *fc)
|
static int nfsd_fs_get_tree(struct fs_context *fc)
|
||||||
{
|
{
|
||||||
fc->s_fs_info = get_net(fc->net_ns);
|
return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns));
|
||||||
return vfs_get_super(fc, vfs_get_keyed_super, nfsd_fill_super);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
static void nfsd_fs_free_fc(struct fs_context *fc)
|
static void nfsd_fs_free_fc(struct fs_context *fc)
|
||||||
|
|
|
@ -157,8 +157,7 @@ static int proc_get_tree(struct fs_context *fc)
|
||||||
{
|
{
|
||||||
struct proc_fs_context *ctx = fc->fs_private;
|
struct proc_fs_context *ctx = fc->fs_private;
|
||||||
|
|
||||||
fc->s_fs_info = ctx->pid_ns;
|
return get_tree_keyed(fc, proc_fill_super, ctx->pid_ns);
|
||||||
return vfs_get_super(fc, vfs_get_keyed_super, proc_fill_super);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
static void proc_fs_context_free(struct fs_context *fc)
|
static void proc_fs_context_free(struct fs_context *fc)
|
||||||
|
|
104
fs/super.c
104
fs/super.c
|
@ -1211,7 +1211,18 @@ int get_tree_single(struct fs_context *fc,
|
||||||
}
|
}
|
||||||
EXPORT_SYMBOL(get_tree_single);
|
EXPORT_SYMBOL(get_tree_single);
|
||||||
|
|
||||||
|
int get_tree_keyed(struct fs_context *fc,
|
||||||
|
int (*fill_super)(struct super_block *sb,
|
||||||
|
struct fs_context *fc),
|
||||||
|
void *key)
|
||||||
|
{
|
||||||
|
fc->s_fs_info = key;
|
||||||
|
return vfs_get_super(fc, vfs_get_keyed_super, fill_super);
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL(get_tree_keyed);
|
||||||
|
|
||||||
#ifdef CONFIG_BLOCK
|
#ifdef CONFIG_BLOCK
|
||||||
|
|
||||||
static int set_bdev_super(struct super_block *s, void *data)
|
static int set_bdev_super(struct super_block *s, void *data)
|
||||||
{
|
{
|
||||||
s->s_bdev = data;
|
s->s_bdev = data;
|
||||||
|
@ -1221,6 +1232,99 @@ static int set_bdev_super(struct super_block *s, void *data)
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
static int set_bdev_super_fc(struct super_block *s, struct fs_context *fc)
|
||||||
|
{
|
||||||
|
return set_bdev_super(s, fc->sget_key);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int test_bdev_super_fc(struct super_block *s, struct fs_context *fc)
|
||||||
|
{
|
||||||
|
return s->s_bdev == fc->sget_key;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* get_tree_bdev - Get a superblock based on a single block device
|
||||||
|
* @fc: The filesystem context holding the parameters
|
||||||
|
* @fill_super: Helper to initialise a new superblock
|
||||||
|
*/
|
||||||
|
int get_tree_bdev(struct fs_context *fc,
|
||||||
|
int (*fill_super)(struct super_block *,
|
||||||
|
struct fs_context *))
|
||||||
|
{
|
||||||
|
struct block_device *bdev;
|
||||||
|
struct super_block *s;
|
||||||
|
fmode_t mode = FMODE_READ | FMODE_EXCL;
|
||||||
|
int error = 0;
|
||||||
|
|
||||||
|
if (!(fc->sb_flags & SB_RDONLY))
|
||||||
|
mode |= FMODE_WRITE;
|
||||||
|
|
||||||
|
if (!fc->source)
|
||||||
|
return invalf(fc, "No source specified");
|
||||||
|
|
||||||
|
bdev = blkdev_get_by_path(fc->source, mode, fc->fs_type);
|
||||||
|
if (IS_ERR(bdev)) {
|
||||||
|
errorf(fc, "%s: Can't open blockdev", fc->source);
|
||||||
|
return PTR_ERR(bdev);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Once the superblock is inserted into the list by sget_fc(), 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);
|
||||||
|
warnf(fc, "%pg: Can't mount, blockdev is frozen", bdev);
|
||||||
|
return -EBUSY;
|
||||||
|
}
|
||||||
|
|
||||||
|
fc->sb_flags |= SB_NOSEC;
|
||||||
|
fc->sget_key = bdev;
|
||||||
|
s = sget_fc(fc, test_bdev_super_fc, set_bdev_super_fc);
|
||||||
|
mutex_unlock(&bdev->bd_fsfreeze_mutex);
|
||||||
|
if (IS_ERR(s))
|
||||||
|
return PTR_ERR(s);
|
||||||
|
|
||||||
|
if (s->s_root) {
|
||||||
|
/* Don't summarily change the RO/RW state. */
|
||||||
|
if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
|
||||||
|
warnf(fc, "%pg: Can't mount, would change RO state", bdev);
|
||||||
|
deactivate_locked_super(s);
|
||||||
|
blkdev_put(bdev, mode);
|
||||||
|
return -EBUSY;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* s_umount nests inside bd_mutex during
|
||||||
|
* __invalidate_device(). blkdev_put() acquires
|
||||||
|
* bd_mutex and can't be called under s_umount. Drop
|
||||||
|
* s_umount temporarily. This is safe as we're
|
||||||
|
* holding an active reference.
|
||||||
|
*/
|
||||||
|
up_write(&s->s_umount);
|
||||||
|
blkdev_put(bdev, mode);
|
||||||
|
down_write(&s->s_umount);
|
||||||
|
} else {
|
||||||
|
s->s_mode = mode;
|
||||||
|
snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
|
||||||
|
sb_set_blocksize(s, block_size(bdev));
|
||||||
|
error = fill_super(s, fc);
|
||||||
|
if (error) {
|
||||||
|
deactivate_locked_super(s);
|
||||||
|
return error;
|
||||||
|
}
|
||||||
|
|
||||||
|
s->s_flags |= SB_ACTIVE;
|
||||||
|
bdev->bd_super = s;
|
||||||
|
}
|
||||||
|
|
||||||
|
BUG_ON(fc->root);
|
||||||
|
fc->root = dget(s->s_root);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL(get_tree_bdev);
|
||||||
|
|
||||||
static int test_bdev_super(struct super_block *s, void *data)
|
static int test_bdev_super(struct super_block *s, void *data)
|
||||||
{
|
{
|
||||||
return (void *)s->s_bdev == data;
|
return (void *)s->s_bdev == data;
|
||||||
|
|
|
@ -88,6 +88,7 @@ struct fs_context {
|
||||||
struct mutex uapi_mutex; /* Userspace access mutex */
|
struct mutex uapi_mutex; /* Userspace access mutex */
|
||||||
struct file_system_type *fs_type;
|
struct file_system_type *fs_type;
|
||||||
void *fs_private; /* The filesystem's context */
|
void *fs_private; /* The filesystem's context */
|
||||||
|
void *sget_key;
|
||||||
struct dentry *root; /* The root and superblock */
|
struct dentry *root; /* The root and superblock */
|
||||||
struct user_namespace *user_ns; /* The user namespace for this mount */
|
struct user_namespace *user_ns; /* The user namespace for this mount */
|
||||||
struct net *net_ns; /* The network namespace for this mount */
|
struct net *net_ns; /* The network namespace for this mount */
|
||||||
|
@ -136,7 +137,7 @@ extern int vfs_get_tree(struct fs_context *fc);
|
||||||
extern void put_fs_context(struct fs_context *fc);
|
extern void put_fs_context(struct fs_context *fc);
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* sget() wrapper to be called from the ->get_tree() op.
|
* sget() wrappers to be called from the ->get_tree() op.
|
||||||
*/
|
*/
|
||||||
enum vfs_get_super_keying {
|
enum vfs_get_super_keying {
|
||||||
vfs_get_single_super, /* Only one such superblock may exist */
|
vfs_get_single_super, /* Only one such superblock may exist */
|
||||||
|
@ -147,12 +148,21 @@ extern int vfs_get_super(struct fs_context *fc,
|
||||||
enum vfs_get_super_keying keying,
|
enum vfs_get_super_keying keying,
|
||||||
int (*fill_super)(struct super_block *sb,
|
int (*fill_super)(struct super_block *sb,
|
||||||
struct fs_context *fc));
|
struct fs_context *fc));
|
||||||
|
|
||||||
extern int get_tree_nodev(struct fs_context *fc,
|
extern int get_tree_nodev(struct fs_context *fc,
|
||||||
int (*fill_super)(struct super_block *sb,
|
int (*fill_super)(struct super_block *sb,
|
||||||
struct fs_context *fc));
|
struct fs_context *fc));
|
||||||
extern int get_tree_single(struct fs_context *fc,
|
extern int get_tree_single(struct fs_context *fc,
|
||||||
int (*fill_super)(struct super_block *sb,
|
int (*fill_super)(struct super_block *sb,
|
||||||
struct fs_context *fc));
|
struct fs_context *fc));
|
||||||
|
extern int get_tree_keyed(struct fs_context *fc,
|
||||||
|
int (*fill_super)(struct super_block *sb,
|
||||||
|
struct fs_context *fc),
|
||||||
|
void *key);
|
||||||
|
|
||||||
|
extern int get_tree_bdev(struct fs_context *fc,
|
||||||
|
int (*fill_super)(struct super_block *sb,
|
||||||
|
struct fs_context *fc));
|
||||||
|
|
||||||
extern const struct file_operations fscontext_fops;
|
extern const struct file_operations fscontext_fops;
|
||||||
|
|
||||||
|
|
|
@ -14,6 +14,9 @@
|
||||||
#include <linux/fs.h>
|
#include <linux/fs.h>
|
||||||
#include <linux/mount.h>
|
#include <linux/mount.h>
|
||||||
|
|
||||||
|
extern int get_tree_mtd(struct fs_context *fc,
|
||||||
|
int (*fill_super)(struct super_block *sb,
|
||||||
|
struct fs_context *fc));
|
||||||
extern struct dentry *mount_mtd(struct file_system_type *fs_type, int flags,
|
extern struct dentry *mount_mtd(struct file_system_type *fs_type, int flags,
|
||||||
const char *dev_name, void *data,
|
const char *dev_name, void *data,
|
||||||
int (*fill_super)(struct super_block *, void *, int));
|
int (*fill_super)(struct super_block *, void *, int));
|
||||||
|
|
|
@ -364,8 +364,7 @@ static int mqueue_get_tree(struct fs_context *fc)
|
||||||
{
|
{
|
||||||
struct mqueue_fs_context *ctx = fc->fs_private;
|
struct mqueue_fs_context *ctx = fc->fs_private;
|
||||||
|
|
||||||
fc->s_fs_info = ctx->ipc_ns;
|
return get_tree_keyed(fc, mqueue_fill_super, ctx->ipc_ns);
|
||||||
return vfs_get_super(fc, vfs_get_keyed_super, mqueue_fill_super);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
static void mqueue_fs_context_free(struct fs_context *fc)
|
static void mqueue_fs_context_free(struct fs_context *fc)
|
||||||
|
|
|
@ -1416,8 +1416,7 @@ EXPORT_SYMBOL_GPL(gssd_running);
|
||||||
|
|
||||||
static int rpc_fs_get_tree(struct fs_context *fc)
|
static int rpc_fs_get_tree(struct fs_context *fc)
|
||||||
{
|
{
|
||||||
fc->s_fs_info = get_net(fc->net_ns);
|
return get_tree_keyed(fc, rpc_fill_super, get_net(fc->net_ns));
|
||||||
return vfs_get_super(fc, vfs_get_keyed_super, rpc_fill_super);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
static void rpc_fs_free_fc(struct fs_context *fc)
|
static void rpc_fs_free_fc(struct fs_context *fc)
|
||||||
|
|
Loading…
Reference in a new issue