From 70688e4dd1647f0ceb502bbd5964fa344c5eb411 Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Mon, 28 Apr 2008 02:13:02 -0700 Subject: xip: support non-struct page backed memory Convert XIP to support non-struct page backed memory, using VM_MIXEDMAP for the user mappings. This requires the get_xip_page API to be changed to an address based one. Improve the API layering a little bit too, while we're here. This is required in order to support XIP filesystems on memory that isn't backed with struct page (but memory with struct page is still supported too). Signed-off-by: Nick Piggin Acked-by: Carsten Otte Cc: Jared Hulbert Cc: Martin Schwidefsky Cc: Heiko Carstens Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ext2/inode.c | 2 +- fs/ext2/xip.c | 37 +++++++++++++++---------------------- fs/ext2/xip.h | 9 +++++---- 3 files changed, 21 insertions(+), 27 deletions(-) (limited to 'fs/ext2') diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c index b8a2990bab8..687023bdfd1 100644 --- a/fs/ext2/inode.c +++ b/fs/ext2/inode.c @@ -796,7 +796,7 @@ const struct address_space_operations ext2_aops = { const struct address_space_operations ext2_aops_xip = { .bmap = ext2_bmap, - .get_xip_page = ext2_get_xip_page, + .get_xip_mem = ext2_get_xip_mem, }; const struct address_space_operations ext2_nobh_aops = { diff --git a/fs/ext2/xip.c b/fs/ext2/xip.c index 430b4c8ee97..233f7fdbe31 100644 --- a/fs/ext2/xip.c +++ b/fs/ext2/xip.c @@ -15,26 +15,28 @@ #include "xip.h" static inline int -__inode_direct_access(struct inode *inode, sector_t sector, +__inode_direct_access(struct inode *inode, sector_t block, void **kaddr, unsigned long *pfn) { struct block_device *bdev = inode->i_sb->s_bdev; struct block_device_operations *ops = bdev->bd_disk->fops; + sector_t sector; + + sector = block * (PAGE_SIZE / 512); /* ext2 block to bdev sector */ BUG_ON(!ops->direct_access); return ops->direct_access(bdev, sector, kaddr, pfn); } static inline int -__ext2_get_sector(struct inode *inode, sector_t offset, int create, +__ext2_get_block(struct inode *inode, pgoff_t pgoff, int create, sector_t *result) { struct buffer_head tmp; int rc; memset(&tmp, 0, sizeof(struct buffer_head)); - rc = ext2_get_block(inode, offset/ (PAGE_SIZE/512), &tmp, - create); + rc = ext2_get_block(inode, pgoff, &tmp, create); *result = tmp.b_blocknr; /* did we get a sparse block (hole in the file)? */ @@ -47,14 +49,13 @@ __ext2_get_sector(struct inode *inode, sector_t offset, int create, } int -ext2_clear_xip_target(struct inode *inode, int block) +ext2_clear_xip_target(struct inode *inode, sector_t block) { - sector_t sector = block * (PAGE_SIZE/512); void *kaddr; unsigned long pfn; int rc; - rc = __inode_direct_access(inode, sector, &kaddr, &pfn); + rc = __inode_direct_access(inode, block, &kaddr, &pfn); if (!rc) clear_page(kaddr); return rc; @@ -72,26 +73,18 @@ void ext2_xip_verify_sb(struct super_block *sb) } } -struct page * -ext2_get_xip_page(struct address_space *mapping, sector_t offset, - int create) +int ext2_get_xip_mem(struct address_space *mapping, pgoff_t pgoff, int create, + void **kmem, unsigned long *pfn) { int rc; - void *kaddr; - unsigned long pfn; - sector_t sector; + sector_t block; /* first, retrieve the sector number */ - rc = __ext2_get_sector(mapping->host, offset, create, §or); + rc = __ext2_get_block(mapping->host, pgoff, create, &block); if (rc) - goto error; + return rc; /* retrieve address of the target data */ - rc = __inode_direct_access - (mapping->host, sector * (PAGE_SIZE/512), &kaddr, &pfn); - if (!rc) - return pfn_to_page(pfn); - - error: - return ERR_PTR(rc); + rc = __inode_direct_access(mapping->host, block, kmem, pfn); + return rc; } diff --git a/fs/ext2/xip.h b/fs/ext2/xip.h index aa85331d6c5..18b34d2f31b 100644 --- a/fs/ext2/xip.h +++ b/fs/ext2/xip.h @@ -7,19 +7,20 @@ #ifdef CONFIG_EXT2_FS_XIP extern void ext2_xip_verify_sb (struct super_block *); -extern int ext2_clear_xip_target (struct inode *, int); +extern int ext2_clear_xip_target (struct inode *, sector_t); static inline int ext2_use_xip (struct super_block *sb) { struct ext2_sb_info *sbi = EXT2_SB(sb); return (sbi->s_mount_opt & EXT2_MOUNT_XIP); } -struct page* ext2_get_xip_page (struct address_space *, sector_t, int); -#define mapping_is_xip(map) unlikely(map->a_ops->get_xip_page) +int ext2_get_xip_mem(struct address_space *, pgoff_t, int, + void **, unsigned long *); +#define mapping_is_xip(map) unlikely(map->a_ops->get_xip_mem) #else #define mapping_is_xip(map) 0 #define ext2_xip_verify_sb(sb) do { } while (0) #define ext2_use_xip(sb) 0 #define ext2_clear_xip_target(inode, chain) 0 -#define ext2_get_xip_page NULL +#define ext2_get_xip_mem NULL #endif -- cgit v1.2.3