Remove Btrfs compat code for older kernels
Btrfs had compatibility code for kernels back to 2.6.18. These have
been removed, and will be maintained in a separate backport
git tree from now on.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index adb169d..48a3dc0 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2073,104 +2073,6 @@
return ret;
}
-/* Kernels earlier than 2.6.28 still have the NFS deadlock where nfsd
- will call the file system's ->lookup() method from within its
- filldir callback, which in turn was called from the file system's
- ->readdir() method. And will deadlock for many file systems. */
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
-
-struct nfshack_dirent {
- u64 ino;
- loff_t offset;
- int namlen;
- unsigned int d_type;
- char name[];
-};
-
-struct nfshack_readdir {
- char *dirent;
- size_t used;
- int full;
-};
-
-
-
-static int btrfs_nfshack_filldir(void *__buf, const char *name, int namlen,
- loff_t offset, u64 ino, unsigned int d_type)
-{
- struct nfshack_readdir *buf = __buf;
- struct nfshack_dirent *de = (void *)(buf->dirent + buf->used);
- unsigned int reclen;
-
- reclen = ALIGN(sizeof(struct nfshack_dirent) + namlen, sizeof(u64));
- if (buf->used + reclen > PAGE_SIZE) {
- buf->full = 1;
- return -EINVAL;
- }
-
- de->namlen = namlen;
- de->offset = offset;
- de->ino = ino;
- de->d_type = d_type;
- memcpy(de->name, name, namlen);
- buf->used += reclen;
-
- return 0;
-}
-
-static int btrfs_nfshack_readdir(struct file *file, void *dirent,
- filldir_t filldir)
-{
- struct nfshack_readdir buf;
- struct nfshack_dirent *de;
- int err;
- int size;
- loff_t offset;
-
- buf.dirent = (void *)__get_free_page(GFP_KERNEL);
- if (!buf.dirent)
- return -ENOMEM;
-
- offset = file->f_pos;
-
- do {
- unsigned int reclen;
-
- buf.used = 0;
- buf.full = 0;
- err = btrfs_real_readdir(file, &buf, btrfs_nfshack_filldir);
- if (err)
- break;
-
- size = buf.used;
-
- if (!size)
- break;
-
- de = (struct nfshack_dirent *)buf.dirent;
- while (size > 0) {
- offset = de->offset;
-
- if (filldir(dirent, de->name, de->namlen, de->offset,
- de->ino, de->d_type))
- goto done;
- offset = file->f_pos;
-
- reclen = ALIGN(sizeof(*de) + de->namlen,
- sizeof(u64));
- size -= reclen;
- de = (struct nfshack_dirent *)((char *)de + reclen);
- }
- } while (buf.full);
-
- done:
- free_page((unsigned long)buf.dirent);
- file->f_pos = offset;
-
- return err;
-}
-#endif
-
int btrfs_write_inode(struct inode *inode, int wait)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -3311,13 +3213,8 @@
{
pgoff_t req_size = last_index - offset + 1;
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
- offset = page_cache_readahead(mapping, ra, file, offset, req_size);
- return offset;
-#else
page_cache_sync_readahead(mapping, ra, file, offset, req_size);
return offset + req_size;
-#endif
}
struct inode *btrfs_alloc_inode(struct super_block *sb)
@@ -3373,14 +3270,7 @@
kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
}
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
static void init_once(void *foo)
-#elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
-static void init_once(struct kmem_cache * cachep, void *foo)
-#else
-static void init_once(void * foo, struct kmem_cache * cachep,
- unsigned long flags)
-#endif
{
struct btrfs_inode *ei = (struct btrfs_inode *) foo;
@@ -3403,22 +3293,10 @@
struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
unsigned long extra_flags,
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
- void (*ctor)(void *)
-#elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
- void (*ctor)(struct kmem_cache *, void *)
-#else
- void (*ctor)(void *, struct kmem_cache *,
- unsigned long)
-#endif
- )
+ void (*ctor)(void *))
{
return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
- SLAB_MEM_SPREAD | extra_flags), ctor
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
- ,NULL
-#endif
- );
+ SLAB_MEM_SPREAD | extra_flags), ctor);
}
int btrfs_init_cachep(void)
@@ -3666,12 +3544,7 @@
return __set_page_dirty_nobuffers(page);
}
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
static int btrfs_permission(struct inode *inode, int mask)
-#else
-static int btrfs_permission(struct inode *inode, int mask,
- struct nameidata *nd)
-#endif
{
if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
return -EACCES;
@@ -3702,11 +3575,7 @@
static struct file_operations btrfs_dir_file_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
- .readdir = btrfs_nfshack_readdir,
-#else /* NFSd readdir/lookup deadlock is fixed */
.readdir = btrfs_real_readdir,
-#endif
.unlocked_ioctl = btrfs_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = btrfs_ioctl,