From ea4802bc0975218544cb447df37b704f60ef2fde Mon Sep 17 00:00:00 2001 From: Richard Braun Date: Fri, 3 May 2013 19:56:51 +0200 Subject: Large store support for ext2fs This is a revised version of the large store patch for ext2fs, written by Ognyan Kulev. It provides support for stores larger than 2 GiB. * ext2fs/balloc.c: Use the new disk_cache_block_ref and disk_cache_block_deref functions to access blocks from the disk cache. * ext2fs/ext2fs.c (main): Update initialization call to pokel_init, and call map_hypermetadata instead of get_hypermetadata. * ext2fs/ext2fs.h: Include and . (DISK_CACHE_BLOCKS): New macro. (DC_INCORE): Likewise. (DC_UNTOUCHED): Likewise. (DC_FIXED): Likewise. (DC_DONT_REUSE): Likewise. (DC_NO_BLOCK): Likewise. (DISK_CACHE_LAST_READ_XOR) [!NDEBUG]: Likewise. (struct disk_cache_info): New structure. (disk_cache): New external variable. (disk_cache_size): Likewise. (disk_cache_blocks): Likewise. (disk_cache_bptr): Likewise. (disk_cache_info): Likewise. (disk_cache_lock): Likewise. (disk_cache_reassociation): Likewise. (disk_cache_block_ref): New declaration. (disk_cache_block_ref_ptr): Likewise. (disk_cache_block_deref): Likewise. (disk_cache_block_is_ref): Likewise. (map_hypermetadata): Likewise. (trunc_block): Cast to off_t. (round_block): Likewise. (boffs): Likewise. (bptr_index): New macro. (boffs_ptr): Rewrite as an inline function to make it look up a block from the disk cache. (bptr_offs): Likewise. (dino): Remove function, replaced with ... (dino_ref): ... this one, which adds a reference to the inode block. (dino_deref): New inline function. (record_global_poke): Make sure block is referenced. (record_indir_poke): Likewise. (sync_global_ptr): Remove block reference, and adjust call to pager_sync_some. (sync_global): Add debug call to print wait parameter. * ext2fs/getblk.c: Use the new disk_cache_block_ref and disk_cache_block_deref functions to access blocks from the disk cache. * ext2fs/hyper.c (get_hypermetadata): Read the superblock from the store now that it's not directly mapped in memory. Move the initialization of zeroblock here from ... (map_hypermetadata): ... here. Also, set the superblock pointer. (diskfs_set_hypermetadata): Add a reference to the superblock. (diskfs_readonly_changed): Update call to mprotect. * ext2fs/ialloc.c: Use the new disk_cache_block_ref, disk_cache_block_ref_ptr and disk_cache_block_deref functions to access blocks from the disk cache. * ext2fs/inode.c: Update calls that used the disk image to use the disk cache, and use the new reference handling functions where appropriate. * ext2fs/pager.c: Include and "../libpager/priv.h". (disk_image): Remove global variable. (disk_pager_read_page): Update cache information. (disk_pager_write_page): Likewise. (disk_pager_notify_evict): New function. (pager_notify_evict): Call disk_pager_notify_evict appropriately. (disk_cache): New global variable. (disk_cache_size): Likewise. (disk_cache_blocks): Likewise. (disk_cache_bptr): Likewise. (disk_cache_info): Likewise. (disk_cache_hint): Likewise. (disk_cache_lock): Likewise. (disk_cache_reassociation): Likewise. (disk_cache_init): New function. (disk_cache_return_unused): Likewise. (disk_cache_block_ref): Likewise. (disk_cache_block_ref_ptr): Likewise. (disk_cache_block_deref): Likewise. (disk_cache_block_is_ref): Likewise. (create_disk_pager): Update initialization of the disk pager. * ext2fs/pokel.c (pokel_add): Drop block references with disk_cache_block_deref. (_pokel_exec): Likewise. * ext2fs/truncate.c (trunc_indirect): Use the new disk_cache_block_ref and disk_cache_block_deref functions to access blocks from the disk cache. --- ext2fs/getblk.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) (limited to 'ext2fs/getblk.c') diff --git a/ext2fs/getblk.c b/ext2fs/getblk.c index 23ba6459..bde66e1c 100644 --- a/ext2fs/getblk.c +++ b/ext2fs/getblk.c @@ -104,7 +104,7 @@ ext2_alloc_block (struct node *node, block_t goal, int zero) if (result && zero) { - char *bh = bptr (result); + char *bh = disk_cache_block_ref (result); bzero (bh, block_size); record_indir_poke (node, bh); } @@ -122,6 +122,8 @@ inode_getblk (struct node *node, int nr, int create, int zero, block_t hint; #endif + assert (0 <= nr && nr < EXT2_N_BLOCKS); + *result = node->dn->info.i_data[nr]; if (*result) return 0; @@ -180,14 +182,20 @@ block_getblk (struct node *node, block_t block, int nr, int create, int zero, { int i; block_t goal = 0; - block_t *bh = (block_t *)bptr (block); + block_t *bh = (block_t *)disk_cache_block_ref (block); *result = bh[nr]; if (*result) - return 0; + { + disk_cache_block_deref (bh); + return 0; + } if (!create) - return EINVAL; + { + disk_cache_block_deref (bh); + return EINVAL; + } if (node->dn->info.i_next_alloc_block == new_block) goal = node->dn->info.i_next_alloc_goal; @@ -207,7 +215,10 @@ block_getblk (struct node *node, block_t block, int nr, int create, int zero, *result = ext2_alloc_block (node, goal, zero); if (!*result) - return ENOSPC; + { + disk_cache_block_deref (bh); + return ENOSPC; + } bh[nr] = *result; -- cgit v1.2.3