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authorDavid Woodhouse <dwmw2@infradead.org>2006-05-19 00:28:49 +0100
committerDavid Woodhouse <dwmw2@infradead.org>2006-05-19 00:28:49 +0100
commitaef9ab47841af45888d950baa6448072cc70bdd5 (patch)
tree79545ddc225f64bc38fa04525ac4125c86202cb8 /fs/jffs2
parentf6a673b3f4f93c1c50e1b18f29254b0531b722a8 (diff)
[JFFS2] Support new device nodes
Device node major/minor numbers are just stored in the payload of a single data node. Just extend that to 4 bytes and use new_encode_dev() for it. We only use the 4-byte format if we _need_ to, if !old_valid_dev(foo). This preserves backwards compatibility with older code as much as possible. If we do make devices with major or minor numbers above 255, and then mount the file system with the old code, it'll just read the first two bytes and get the numbers wrong. If it comes to garbage-collect it, it'll then write back those wrong numbers. But that's about the best we can expect. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'fs/jffs2')
-rw-r--r--fs/jffs2/dir.c12
-rw-r--r--fs/jffs2/fs.c25
-rw-r--r--fs/jffs2/gc.c7
-rw-r--r--fs/jffs2/nodelist.h11
-rw-r--r--fs/jffs2/os-linux.h4
5 files changed, 37 insertions, 22 deletions
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 1c8e8c0f6ce..a6c11cef1b7 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -591,12 +591,12 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, de
struct jffs2_full_dnode *fn;
struct jffs2_full_dirent *fd;
int namelen;
- jint16_t dev;
+ union jffs2_device_node dev;
int devlen = 0;
uint32_t alloclen, phys_ofs;
int ret;
- if (!old_valid_dev(rdev))
+ if (!new_valid_dev(rdev))
return -EINVAL;
ri = jffs2_alloc_raw_inode();
@@ -605,17 +605,15 @@ static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, de
c = JFFS2_SB_INFO(dir_i->i_sb);
- if (S_ISBLK(mode) || S_ISCHR(mode)) {
- dev = cpu_to_je16(old_encode_dev(rdev));
- devlen = sizeof(dev);
- }
+ if (S_ISBLK(mode) || S_ISCHR(mode))
+ devlen = jffs2_encode_dev(&dev, rdev);
/* Try to reserve enough space for both node and dirent.
* Just the node will do for now, though
*/
namelen = dentry->d_name.len;
ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen,
- ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
+ ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
if (ret) {
jffs2_free_raw_inode(ri);
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index ea1f37d4fc5..24cb4c688ef 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -33,7 +33,7 @@ static int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
struct jffs2_raw_inode *ri;
- unsigned short dev;
+ union jffs2_device_node dev;
unsigned char *mdata = NULL;
int mdatalen = 0;
unsigned int ivalid;
@@ -51,9 +51,8 @@ static int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
it out again with the appropriate data attached */
if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
/* For these, we don't actually need to read the old node */
- dev = old_encode_dev(inode->i_rdev);
+ mdatalen = jffs2_encode_dev(&dev, inode->i_rdev);
mdata = (char *)&dev;
- mdatalen = sizeof(dev);
D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen));
} else if (S_ISLNK(inode->i_mode)) {
down(&f->sem);
@@ -232,6 +231,8 @@ void jffs2_read_inode (struct inode *inode)
struct jffs2_inode_info *f;
struct jffs2_sb_info *c;
struct jffs2_raw_inode latest_node;
+ union jffs2_device_node jdev;
+ dev_t rdev = 0;
int ret;
D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino));
@@ -263,7 +264,6 @@ void jffs2_read_inode (struct inode *inode)
inode->i_blocks = (inode->i_size + 511) >> 9;
switch (inode->i_mode & S_IFMT) {
- jint16_t rdev;
case S_IFLNK:
inode->i_op = &jffs2_symlink_inode_operations;
@@ -297,8 +297,16 @@ void jffs2_read_inode (struct inode *inode)
case S_IFBLK:
case S_IFCHR:
/* Read the device numbers from the media */
+ if (f->metadata->size != sizeof(jdev.old) &&
+ f->metadata->size != sizeof(jdev.new)) {
+ printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size);
+ up(&f->sem);
+ jffs2_do_clear_inode(c, f);
+ make_bad_inode(inode);
+ return;
+ }
D1(printk(KERN_DEBUG "Reading device numbers from flash\n"));
- if (jffs2_read_dnode(c, f, f->metadata, (char *)&rdev, 0, sizeof(rdev)) < 0) {
+ if (jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size) < 0) {
/* Eep */
printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino);
up(&f->sem);
@@ -306,12 +314,15 @@ void jffs2_read_inode (struct inode *inode)
make_bad_inode(inode);
return;
}
+ if (f->metadata->size == sizeof(jdev.old))
+ rdev = old_decode_dev(je16_to_cpu(jdev.old));
+ else
+ rdev = new_decode_dev(je32_to_cpu(jdev.new));
case S_IFSOCK:
case S_IFIFO:
inode->i_op = &jffs2_file_inode_operations;
- init_special_inode(inode, inode->i_mode,
- old_decode_dev((je16_to_cpu(rdev))));
+ init_special_inode(inode, inode->i_mode, rdev);
break;
default:
diff --git a/fs/jffs2/gc.c b/fs/jffs2/gc.c
index 967fb2cf8e2..77d30707de5 100644
--- a/fs/jffs2/gc.c
+++ b/fs/jffs2/gc.c
@@ -679,7 +679,7 @@ static int jffs2_garbage_collect_metadata(struct jffs2_sb_info *c, struct jffs2_
struct jffs2_full_dnode *new_fn;
struct jffs2_raw_inode ri;
struct jffs2_node_frag *last_frag;
- jint16_t dev;
+ union jffs2_device_node dev;
char *mdata = NULL, mdatalen = 0;
uint32_t alloclen, phys_ofs, ilen;
int ret;
@@ -687,11 +687,8 @@ static int jffs2_garbage_collect_metadata(struct jffs2_sb_info *c, struct jffs2_
if (S_ISBLK(JFFS2_F_I_MODE(f)) ||
S_ISCHR(JFFS2_F_I_MODE(f)) ) {
/* For these, we don't actually need to read the old node */
- /* FIXME: for minor or major > 255. */
- dev = cpu_to_je16(((JFFS2_F_I_RDEV_MAJ(f) << 8) |
- JFFS2_F_I_RDEV_MIN(f)));
+ mdatalen = jffs2_encode_dev(&dev, JFFS2_F_I_RDEV(f));
mdata = (char *)&dev;
- mdatalen = sizeof(dev);
D1(printk(KERN_DEBUG "jffs2_garbage_collect_metadata(): Writing %d bytes of kdev_t\n", mdatalen));
} else if (S_ISLNK(JFFS2_F_I_MODE(f))) {
mdatalen = fn->size;
diff --git a/fs/jffs2/nodelist.h b/fs/jffs2/nodelist.h
index f6645afe88e..24e0f28a8ba 100644
--- a/fs/jffs2/nodelist.h
+++ b/fs/jffs2/nodelist.h
@@ -268,6 +268,17 @@ static inline uint32_t ref_totlen(struct jffs2_sb_info *c,
#define PAD(x) (((x)+3)&~3)
+static inline int jffs2_encode_dev(union jffs2_device_node *jdev, dev_t rdev)
+{
+ if (old_valid_dev(rdev)) {
+ jdev->old = cpu_to_je16(old_encode_dev(rdev));
+ return sizeof(jdev->old);
+ } else {
+ jdev->new = cpu_to_je32(new_encode_dev(rdev));
+ return sizeof(jdev->new);
+ }
+}
+
static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw)
{
while(raw->next_in_ino) {
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index d307cf54862..a10eb03ac95 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -31,9 +31,7 @@ struct kvec;
#define JFFS2_F_I_MODE(f) (OFNI_EDONI_2SFFJ(f)->i_mode)
#define JFFS2_F_I_UID(f) (OFNI_EDONI_2SFFJ(f)->i_uid)
#define JFFS2_F_I_GID(f) (OFNI_EDONI_2SFFJ(f)->i_gid)
-
-#define JFFS2_F_I_RDEV_MIN(f) (iminor(OFNI_EDONI_2SFFJ(f)))
-#define JFFS2_F_I_RDEV_MAJ(f) (imajor(OFNI_EDONI_2SFFJ(f)))
+#define JFFS2_F_I_RDEV(f) (OFNI_EDONI_2SFFJ(f)->i_rdev)
#define ITIME(sec) ((struct timespec){sec, 0})
#define I_SEC(tv) ((tv).tv_sec)