diff options
Diffstat (limited to 'debian')
| -rw-r--r-- | debian/changelog | 3 | ||||
| -rw-r--r-- | debian/patches-contrib/ext2fs_20040930.diff | 2314 |
2 files changed, 2317 insertions, 0 deletions
diff --git a/debian/changelog b/debian/changelog index c403e841..ee5989b5 100644 --- a/debian/changelog +++ b/debian/changelog @@ -7,6 +7,9 @@ hurd (20040508-4) UNRELEASED; urgency=low command-line options. Make sure the root file system is read-only during the fsck run, and update it to be writable again if fsck succeeds. (Closes: #273508) + * debian/patches-contrib/ext2fs_20040930.diff: New file. Just put it + in debian/patches and recompile the package to get (experimental) + support for ext2 files systems larger than 2GB. [ Guillem Jover ] * debian/hurd.postinst: diff --git a/debian/patches-contrib/ext2fs_20040930.diff b/debian/patches-contrib/ext2fs_20040930.diff new file mode 100644 index 00000000..82ec88b7 --- /dev/null +++ b/debian/patches-contrib/ext2fs_20040930.diff @@ -0,0 +1,2314 @@ +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/console/pager.c hurd/console/pager.c +--- ../cvs/hurd/console/pager.c 2002-09-22 04:28:35.000000000 +0300 ++++ hurd/console/pager.c 2004-09-29 17:49:27.000000000 +0300 +@@ -1,5 +1,5 @@ + /* pager.c - The pager for the display component of a virtual console. +- Copyright (C) 2002 Free Software Foundation, Inc. ++ Copyright (C) 2002, 2004 Free Software Foundation, Inc. + Written by Marcus Brinkmann. + + This file is part of the GNU Hurd. +@@ -94,6 +94,14 @@ pager_unlock_page (struct user_pager_inf + } + + ++void ++pager_notify_evict (struct user_pager_info *pager, ++ vm_offset_t page) ++{ ++ assert (!"unrequested notification on eviction"); ++} ++ ++ + /* Tell how big the file is. */ + error_t + pager_report_extent (struct user_pager_info *upi, +@@ -159,7 +167,7 @@ user_pager_create (struct user_pager *us + + /* XXX Are the values 1 and MEMORY_OBJECT_COPY_DELAY correct? */ + user_pager->pager = pager_create (upi, pager_bucket, +- 1, MEMORY_OBJECT_COPY_DELAY); ++ 1, MEMORY_OBJECT_COPY_DELAY, 0); + if (!user_pager->pager) + { + free (upi); +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ext2fs/balloc.c hurd/ext2fs/balloc.c +--- ../cvs/hurd/ext2fs/balloc.c 2000-03-10 06:54:55.000000000 +0200 ++++ hurd/ext2fs/balloc.c 2004-09-25 17:37:38.000000000 +0300 +@@ -1,6 +1,6 @@ + /* Block allocation routines + +- Copyright (C) 1995,99,2000 Free Software Foundation, Inc. ++ Copyright (C) 1995, 1999, 2000, 2004 Free Software Foundation, Inc. + + Converted to work under the hurd by Miles Bader <miles@gnu.org> + +@@ -92,7 +92,7 @@ ext2_free_blocks (block_t block, unsigne + block, count); + } + gdp = group_desc (block_group); +- bh = bptr (gdp->bg_block_bitmap); ++ bh = disk_cache_block_ref (gdp->bg_block_bitmap); + + if (in_range (gdp->bg_block_bitmap, block, gcount) || + in_range (gdp->bg_inode_bitmap, block, gcount) || +@@ -114,6 +114,7 @@ ext2_free_blocks (block_t block, unsigne + } + + record_global_poke (bh); ++ disk_cache_block_ref_ptr (gdp); + record_global_poke (gdp); + + block += gcount; +@@ -139,7 +140,7 @@ ext2_new_block (block_t goal, + block_t prealloc_goal, + block_t *prealloc_count, block_t *prealloc_block) + { +- char *bh; ++ char *bh = 0; + char *p, *r; + int i, j, k, tmp; + unsigned long lmap; +@@ -164,9 +165,10 @@ ext2_new_block (block_t goal, + + ext2_debug ("goal=%u", goal); + +-repeat: ++ repeat: ++ assert (! bh); + /* +- * First, test whether the goal block is free. ++ * First, test whether the goal block is free. + */ + if (goal < sblock->s_first_data_block || goal >= sblock->s_blocks_count) + goal = sblock->s_first_data_block; +@@ -179,7 +181,7 @@ repeat: + if (j) + goal_attempts++; + #endif +- bh = bptr (gdp->bg_block_bitmap); ++ bh = disk_cache_block_ref (gdp->bg_block_bitmap); + + ext2_debug ("goal is at %d:%d", i, j); + +@@ -194,8 +196,8 @@ repeat: + if (j) + { + /* +- * The goal was occupied; search forward for a free +- * block within the next 32 blocks ++ * The goal was occupied; search forward for a free ++ * block within the next 32 blocks + */ + lmap = ((((unsigned long *) bh)[j >> 5]) >> + ((j & 31) + 1)); +@@ -242,13 +244,16 @@ repeat: + j = k; + goto got_block; + } ++ ++ disk_cache_block_deref (bh); ++ bh = 0; + } + + ext2_debug ("bit not found in block group %d", i); + + /* +- * Now search the rest of the groups. We assume that +- * i and gdp correctly point to the last group visited. ++ * Now search the rest of the groups. We assume that ++ * i and gdp correctly point to the last group visited. + */ + for (k = 0; k < groups_count; k++) + { +@@ -264,7 +269,8 @@ repeat: + spin_unlock (&global_lock); + return 0; + } +- bh = bptr (gdp->bg_block_bitmap); ++ assert (! bh); ++ bh = disk_cache_block_ref (gdp->bg_block_bitmap); + r = memscan (bh, 0, sblock->s_blocks_per_group >> 3); + j = (r - bh) << 3; + if (j < sblock->s_blocks_per_group) +@@ -274,21 +280,25 @@ repeat: + sblock->s_blocks_per_group); + if (j >= sblock->s_blocks_per_group) + { ++ disk_cache_block_deref (bh); ++ bh = 0; + ext2_error ("free blocks count corrupted for block group %d", i); + spin_unlock (&global_lock); + return 0; + } + +-search_back: ++ search_back: ++ assert (bh); + /* +- * We have succeeded in finding a free byte in the block +- * bitmap. Now search backwards up to 7 bits to find the +- * start of this group of free blocks. ++ * We have succeeded in finding a free byte in the block ++ * bitmap. Now search backwards up to 7 bits to find the ++ * start of this group of free blocks. + */ + for (k = 0; k < 7 && j > 0 && !test_bit (j - 1, bh); k++, j--); + +-got_block: +- ++ got_block: ++ assert (bh); ++ + ext2_debug ("using block group %d (%d)", i, gdp->bg_free_blocks_count); + + tmp = j + i * sblock->s_blocks_per_group + sblock->s_first_data_block; +@@ -301,6 +311,8 @@ got_block: + if (set_bit (j, bh)) + { + ext2_warning ("bit already set for block %d", j); ++ disk_cache_block_deref (bh); ++ bh = 0; + goto repeat; + } + +@@ -317,7 +329,7 @@ got_block: + ext2_debug ("found bit %d", j); + + /* +- * Do block preallocation now if required. ++ * Do block preallocation now if required. + */ + #ifdef EXT2_PREALLOCATE + if (prealloc_goal) +@@ -348,6 +360,7 @@ got_block: + j = tmp; + + record_global_poke (bh); ++ bh = 0; + + if (j >= sblock->s_blocks_count) + { +@@ -360,12 +373,14 @@ got_block: + j, goal_hits, goal_attempts); + + gdp->bg_free_blocks_count--; ++ disk_cache_block_ref_ptr (gdp); + record_global_poke (gdp); + + sblock->s_free_blocks_count--; + sblock_dirty = 1; + + sync_out: ++ assert (! bh); + spin_unlock (&global_lock); + alloc_sync (0); + +@@ -387,9 +402,12 @@ ext2_count_free_blocks () + gdp = NULL; + for (i = 0; i < groups_count; i++) + { ++ void *bh; + gdp = group_desc (i); + desc_count += gdp->bg_free_blocks_count; +- x = count_free (bptr (gdp->bg_block_bitmap), block_size); ++ bh = disk_cache_block_ref (gdp->bg_block_bitmap); ++ x = count_free (bh, block_size); ++ disk_cache_block_deref (bh); + printf ("group %d: stored = %d, counted = %lu", + i, gdp->bg_free_blocks_count, x); + bitmap_count += x; +@@ -450,7 +468,7 @@ ext2_check_blocks_bitmap () + + gdp = group_desc (i); + desc_count += gdp->bg_free_blocks_count; +- bh = bptr (gdp->bg_block_bitmap); ++ bh = disk_cache_block_ref (gdp->bg_block_bitmap); + + if (!EXT2_HAS_RO_COMPAT_FEATURE (sblock, + EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER) +@@ -476,6 +494,7 @@ ext2_check_blocks_bitmap () + ext2_error ("block #%d of the inode table in group %d is marked free", j, i); + + x = count_free (bh, block_size); ++ disk_cache_block_deref (bh); + if (gdp->bg_free_blocks_count != x) + ext2_error ("wrong free blocks count for group %d," + " stored = %d, counted = %lu", +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ext2fs/ext2fs.c hurd/ext2fs/ext2fs.c +--- ../cvs/hurd/ext2fs/ext2fs.c 2002-06-03 00:40:56.000000000 +0300 ++++ hurd/ext2fs/ext2fs.c 2004-09-25 17:37:38.000000000 +0300 +@@ -1,6 +1,6 @@ + /* Main entry point for the ext2 file system translator + +- Copyright (C) 1994,95,96,97,98,99,2002 Free Software Foundation, Inc. ++ Copyright (C) 1994,95,96,97,98,99,2002,04 Free Software Foundation, Inc. + + Converted for ext2fs by Miles Bader <miles@gnu.ai.mit.edu> + +@@ -106,7 +106,7 @@ parse_opt (int key, char *arg, struct ar + if (values == 0) + return ENOMEM; + state->hook = values; +- bzero (values, sizeof *values); ++ memset (values, 0, sizeof *values); + values->sb_block = SBLOCK_BLOCK; + break; + +@@ -181,9 +181,9 @@ main (int argc, char **argv) + /* Map the entire disk. */ + create_disk_pager (); + +- pokel_init (&global_pokel, diskfs_disk_pager, disk_image); ++ pokel_init (&global_pokel, diskfs_disk_pager, disk_cache); + +- get_hypermetadata(); ++ map_hypermetadata (); + + inode_init (); + +@@ -211,6 +211,8 @@ diskfs_reload_global_state () + { + pokel_flush (&global_pokel); + pager_flush (diskfs_disk_pager, 1); ++ sblock = 0; + get_hypermetadata (); ++ map_hypermetadata (); + return 0; + } +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ext2fs/ext2fs.h hurd/ext2fs/ext2fs.h +--- ../cvs/hurd/ext2fs/ext2fs.h 2004-01-11 00:08:58.000000000 +0200 ++++ hurd/ext2fs/ext2fs.h 2004-09-29 18:17:09.000000000 +0300 +@@ -23,7 +23,9 @@ + #include <hurd/pager.h> + #include <hurd/fshelp.h> + #include <hurd/iohelp.h> ++#include <hurd/store.h> + #include <hurd/diskfs.h> ++#include <hurd/ihash.h> + #include <assert.h> + #include <rwlock.h> + #include <sys/mman.h> +@@ -186,6 +188,8 @@ struct user_pager_info + /* ---------------------------------------------------------------- */ + /* pager.c */ + ++#define DISK_CACHE_BLOCKS 100 ++ + #include <hurd/diskfs-pager.h> + + /* Set up the disk pager. */ +@@ -209,10 +213,47 @@ extern struct store *store; + /* What the user specified. */ + extern struct store_parsed *store_parsed; + +-/* Mapped image of the disk. */ +-extern void *disk_image; ++/* Mapped image of cached blocks of the disk. */ ++extern void *disk_cache; ++extern store_offset_t disk_cache_size; ++extern int disk_cache_blocks; ++ ++#define DC_INCORE 0x01 /* Not in core. */ ++#define DC_UNTOUCHED 0x02 /* Not touched by disk_pager_read_paged ++ or disk_cache_block_ref. */ ++#define DC_FIXED 0x04 /* Must not be re-associated. */ ++ ++/* Flags that forbid re-association of page. DC_UNTOUCHED is included ++ because this flag is used only when page is already to be ++ re-associated, so it's not good candidate for another ++ remapping. */ ++#define DC_DONT_REUSE (DC_INCORE | DC_UNTOUCHED | DC_FIXED) ++ ++#define DC_NO_BLOCK ((block_t) -1L) ++ ++/* Disk cache blocks' meta info. */ ++struct disk_cache_info ++{ ++ block_t block; ++ uint16_t flags; ++ uint16_t ref_count; ++}; ++ ++/* block num --> pointer to in-memory block */ ++extern hurd_ihash_t disk_cache_bptr; ++/* Metadata about cached block. */ ++extern struct disk_cache_info *disk_cache_info; ++/* Lock for these mappings */ ++extern struct mutex disk_cache_lock; ++/* Fired when a re-association is done. */ ++extern struct condition disk_cache_reassociation; ++ ++void *disk_cache_block_ref (block_t block); ++void disk_cache_block_ref_ptr (void *ptr); ++void disk_cache_block_deref (void *ptr); ++int disk_cache_block_is_ref (block_t block); + +-/* Our in-core copy of the super-block (pointer into the disk_image). */ ++/* Our in-core copy of the super-block (pointer into the disk_cache). */ + struct ext2_super_block *sblock; + /* True if sblock has been modified. */ + int sblock_dirty; +@@ -242,6 +283,9 @@ vm_address_t zeroblock; + + /* Get the superblock from the disk, & setup various global info from it. */ + void get_hypermetadata (); ++ ++/* Map `sblock' and `group_desc_image' pointers to disk cache. */ ++void map_hypermetadata (); + + /* ---------------------------------------------------------------- */ + /* Random stuff calculated from the super block. */ +@@ -265,21 +309,51 @@ spin_lock_t generation_lock; + unsigned long next_generation; + + /* ---------------------------------------------------------------- */ +-/* Functions for looking inside disk_image */ ++/* Functions for looking inside disk_cache */ + +-#define trunc_block(offs) (((offs) >> log2_block_size) << log2_block_size) ++#define trunc_block(offs) \ ++ ((off_t) ((offs) >> log2_block_size) << log2_block_size) + #define round_block(offs) \ +- ((((offs) + block_size - 1) >> log2_block_size) << log2_block_size) ++ ((off_t) (((offs) + block_size - 1) >> log2_block_size) << log2_block_size) + + /* block num --> byte offset on disk */ +-#define boffs(block) ((block) << log2_block_size) ++#define boffs(block) ((off_t) (block) << log2_block_size) + /* byte offset on disk --> block num */ + #define boffs_block(offs) ((offs) >> log2_block_size) + ++/* pointer to in-memory block -> index in disk_cache_info */ ++#define bptr_index(ptr) (((char *)ptr - (char *)disk_cache) >> log2_block_size) ++ + /* byte offset on disk --> pointer to in-memory block */ +-#define boffs_ptr(offs) (((char *)disk_image) + (offs)) ++EXT2FS_EI char * ++boffs_ptr (off_t offset) ++{ ++ block_t block = boffs_block (offset); ++ mutex_lock (&disk_cache_lock); ++ char *ptr = hurd_ihash_find (disk_cache_bptr, block); ++ mutex_unlock (&disk_cache_lock); ++ assert (ptr); ++ ptr += offset % block_size; ++ ext2_debug ("(%Ld) = %p", offset, ptr); ++ return ptr; ++} ++ + /* pointer to in-memory block --> byte offset on disk */ +-#define bptr_offs(ptr) ((char *)(ptr) - ((char *)disk_image)) ++EXT2FS_EI off_t ++bptr_offs (void *ptr) ++{ ++ vm_offset_t mem_offset = (char *)ptr - (char *)disk_cache; ++ off_t offset; ++ assert (mem_offset < disk_cache_size); ++ mutex_lock (&disk_cache_lock); ++ offset = (off_t) disk_cache_info[boffs_block (mem_offset)].block ++ << log2_block_size; ++ assert (offset || mem_offset < block_size); ++ offset += mem_offset % block_size; ++ mutex_unlock (&disk_cache_lock); ++ ext2_debug ("(%p) = %Ld", ptr, offset); ++ return offset; ++} + + /* block num --> pointer to in-memory block */ + #define bptr(block) boffs_ptr(boffs(block)) +@@ -296,14 +370,24 @@ struct ext2_group_desc *group_desc_image + + /* Convert an inode number to the dinode on disk. */ + EXT2FS_EI struct ext2_inode * +-dino (ino_t inum) ++dino_ref (ino_t inum) + { + unsigned long inodes_per_group = sblock->s_inodes_per_group; + unsigned long bg_num = (inum - 1) / inodes_per_group; + unsigned long group_inum = (inum - 1) % inodes_per_group; +- struct ext2_group_desc *bg = group_desc(bg_num); ++ struct ext2_group_desc *bg = group_desc (bg_num); + block_t block = bg->bg_inode_table + (group_inum / inodes_per_block); +- return ((struct ext2_inode *)bptr(block)) + group_inum % inodes_per_block; ++ struct ext2_inode *inode = disk_cache_block_ref (block); ++ inode += group_inum % inodes_per_block; ++ ext2_debug ("(%qd) = %p", inum, inode); ++ return inode; ++} ++ ++EXT2FS_EI void ++dino_deref (struct ext2_inode *inode) ++{ ++ ext2_debug ("(%p)", inode); ++ disk_cache_block_deref (inode); + } + + /* ---------------------------------------------------------------- */ +@@ -356,27 +440,38 @@ global_block_modified (block_t block) + EXT2FS_EI void + record_global_poke (void *ptr) + { +- int boffs = trunc_block (bptr_offs (ptr)); +- global_block_modified (boffs_block (boffs)); +- pokel_add (&global_pokel, boffs_ptr(boffs), block_size); ++ block_t block = boffs_block (bptr_offs (ptr)); ++ void *block_ptr = bptr (block); ++ ext2_debug ("(%p = %p)", ptr, block_ptr); ++ assert (disk_cache_block_is_ref (block)); ++ global_block_modified (block); ++ pokel_add (&global_pokel, block_ptr, block_size); + } + + /* This syncs a modification to a non-file block. */ + EXT2FS_EI void + sync_global_ptr (void *bptr, int wait) + { +- vm_offset_t boffs = trunc_block (bptr_offs (bptr)); +- global_block_modified (boffs_block (boffs)); +- pager_sync_some (diskfs_disk_pager, trunc_page (boffs), vm_page_size, wait); ++ block_t block = boffs_block (bptr_offs (bptr)); ++ void *block_ptr = bptr (block); ++ ext2_debug ("(%p -> %u)", bptr, (block_t)block); ++ global_block_modified (block); ++ disk_cache_block_deref (block_ptr); ++ pager_sync_some (diskfs_disk_pager, ++ block_ptr - disk_cache, block_size, wait); ++ + } + + /* This records a modification to one of a file's indirect blocks. */ + EXT2FS_EI void + record_indir_poke (struct node *node, void *ptr) + { +- int boffs = trunc_block (bptr_offs (ptr)); +- global_block_modified (boffs_block (boffs)); +- pokel_add (&node->dn->indir_pokel, boffs_ptr(boffs), block_size); ++ block_t block = boffs_block (bptr_offs (ptr)); ++ void *block_ptr = bptr (block); ++ ext2_debug ("(%d, %p)", (int)node->cache_id, ptr); ++ assert (disk_cache_block_is_ref (block)); ++ global_block_modified (block); ++ pokel_add (&node->dn->indir_pokel, block_ptr, block_size); + } + + /* ---------------------------------------------------------------- */ +@@ -384,6 +479,7 @@ record_indir_poke (struct node *node, vo + EXT2FS_EI void + sync_global (int wait) + { ++ ext2_debug ("%d", wait); + pokel_sync (&global_pokel, wait); + } + +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ext2fs/getblk.c hurd/ext2fs/getblk.c +--- ../cvs/hurd/ext2fs/getblk.c 2004-01-11 00:08:58.000000000 +0200 ++++ hurd/ext2fs/getblk.c 2004-09-25 17:37:38.000000000 +0300 +@@ -52,7 +52,7 @@ ext2_discard_prealloc (struct node *node + if (node->dn->info.i_prealloc_count) + { + int i = node->dn->info.i_prealloc_count; +- ext2_debug ("discarding %d prealloced blocks for inode %d", ++ ext2_debug ("discarding %d prealloced blocks for inode %Ld", + i, node->cache_id); + node->dn->info.i_prealloc_count = 0; + ext2_free_blocks (node->dn->info.i_prealloc_block, i); +@@ -104,8 +104,8 @@ ext2_alloc_block (struct node *node, blo + + if (result && zero) + { +- char *bh = bptr (result); +- bzero (bh, block_size); ++ char *bh = disk_cache_block_ref (result); ++ memset (bh, 0, block_size); + record_indir_poke (node, bh); + } + +@@ -122,6 +122,8 @@ inode_getblk (struct node *node, int nr, + 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 + { + 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 + + *result = ext2_alloc_block (node, goal, zero); + if (!*result) +- return ENOSPC; ++ { ++ disk_cache_block_deref (bh); ++ return ENOSPC; ++ } + + bh[nr] = *result; + +@@ -243,9 +254,9 @@ ext2_getblk (struct node *node, block_t + return EIO; + } + /* +- * If this is a sequential block allocation, set the next_alloc_block +- * to this block now so that all the indblock and data block +- * allocations use the same goal zone ++ * If this is a sequential block allocation, set the next_alloc_block ++ * to this block now so that all the indblock and data block ++ * allocations use the same goal zone + */ + + ext2_debug ("block = %u, next = %u, goal = %u", block, +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ext2fs/hyper.c hurd/ext2fs/hyper.c +--- ../cvs/hurd/ext2fs/hyper.c 2002-06-03 00:40:59.000000000 +0300 ++++ hurd/ext2fs/hyper.c 2004-09-25 17:37:38.000000000 +0300 +@@ -1,6 +1,6 @@ + /* Fetching and storing the hypermetadata (superblock and bg summary info) + +- Copyright (C) 1994,95,96,99,2001,02 Free Software Foundation, Inc. ++ Copyright (C) 1994,95,96,99,2001,02,04 Free Software Foundation, Inc. + Written by Miles Bader <miles@gnu.org> + + This program is free software; you can redistribute it and/or +@@ -58,12 +58,15 @@ static int ext2fs_clean; /* fs clean bef + void + get_hypermetadata (void) + { +- error_t err = diskfs_catch_exception (); +- if (err) +- ext2_panic ("can't read superblock: %s", strerror (err)); +- +- sblock = (struct ext2_super_block *) boffs_ptr (SBLOCK_OFFS); ++ error_t err; ++ size_t read; + ++ assert (! sblock); ++ err = store_read (store, SBLOCK_OFFS >> store->log2_block_size, ++ SBLOCK_SIZE, (void **)&sblock, &read); ++ if (err || read != SBLOCK_SIZE) ++ ext2_panic ("Cannot read hypermetadata"); ++ + if (sblock->s_magic != EXT2_SUPER_MAGIC + #ifdef EXT2FS_PRE_02B_COMPAT + && sblock->s_magic != EXT2_PRE_02B_MAGIC +@@ -152,15 +155,22 @@ get_hypermetadata (void) + + allocate_mod_map (); + +- diskfs_end_catch_exception (); ++ /* A handy source of page-aligned zeros. */ ++ if (zeroblock == 0) ++ zeroblock = (vm_address_t) mmap (0, block_size, PROT_READ, MAP_ANON, 0, 0); ++ ++ munmap (sblock, SBLOCK_SIZE); ++ sblock = NULL; ++} ++ ++void ++map_hypermetadata (void) ++{ ++ sblock = (struct ext2_super_block *) boffs_ptr (SBLOCK_OFFS); + + /* Cache a convenient pointer to the block group descriptors for allocation. + These are stored in the filesystem blocks following the superblock. */ + group_desc_image = (struct ext2_group_desc *) bptr (bptr_block (sblock) + 1); +- +- /* A handy source of page-aligned zeros. */ +- if (zeroblock == 0) +- zeroblock = (vm_address_t) mmap (0, block_size, PROT_READ, MAP_ANON, 0, 0); + } + + error_t +@@ -183,6 +193,7 @@ diskfs_set_hypermetadata (int wait, int + if (sblock_dirty) + { + sblock_dirty = 0; ++ disk_cache_block_ref_ptr (sblock); + record_global_poke (sblock); + } + +@@ -199,7 +210,8 @@ diskfs_readonly_changed (int readonly) + + (*(readonly ? store_set_flags : store_clear_flags)) (store, STORE_READONLY); + +- mprotect (disk_image, store->size, PROT_READ | (readonly ? 0 : PROT_WRITE)); ++ mprotect (disk_cache, disk_cache_size, ++ PROT_READ | (readonly ? 0 : PROT_WRITE)); + + if (!readonly && !(sblock->s_state & EXT2_VALID_FS)) + ext2_warning ("UNCLEANED FILESYSTEM NOW WRITABLE"); +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ext2fs/ialloc.c hurd/ext2fs/ialloc.c +--- ../cvs/hurd/ext2fs/ialloc.c 2002-10-09 02:10:09.000000000 +0300 ++++ hurd/ext2fs/ialloc.c 2004-09-25 17:37:38.000000000 +0300 +@@ -1,6 +1,6 @@ + /* Inode allocation routines. + +- Copyright (C) 1995,96,99,2000,02 Free Software Foundation, Inc. ++ Copyright (C) 1995,96,99,2000,02,04 Free Software Foundation, Inc. + + Converted to work under the hurd by Miles Bader <miles@gnu.org> + +@@ -60,7 +60,7 @@ diskfs_free_node (struct node *np, mode_ + + assert (!diskfs_readonly); + +- ext2_debug ("freeing inode %u", inum); ++ ext2_debug ("freeing inode %Lu", inum); + + spin_lock (&global_lock); + +@@ -75,22 +75,25 @@ diskfs_free_node (struct node *np, mode_ + bit = (inum - 1) % sblock->s_inodes_per_group; + + gdp = group_desc (block_group); +- bh = bptr (gdp->bg_inode_bitmap); ++ bh = disk_cache_block_ref (gdp->bg_inode_bitmap); + + if (!clear_bit (bit, bh)) + ext2_warning ("bit already cleared for inode %Ld", inum); + else + { ++ disk_cache_block_ref_ptr (bh); + record_global_poke (bh); + + gdp->bg_free_inodes_count++; + if (S_ISDIR (old_mode)) + gdp->bg_used_dirs_count--; ++ disk_cache_block_ref_ptr (gdp); + record_global_poke (gdp); + + sblock->s_free_inodes_count++; + } + ++ disk_cache_block_deref (bh); + sblock_dirty = 1; + spin_unlock (&global_lock); + alloc_sync(0); +@@ -111,14 +114,15 @@ diskfs_free_node (struct node *np, mode_ + ino_t + ext2_alloc_inode (ino_t dir_inum, mode_t mode) + { +- char *bh; ++ char *bh = 0; + int i, j, inum, avefreei; + struct ext2_group_desc *gdp; + struct ext2_group_desc *tmp; + + spin_lock (&global_lock); + +-repeat: ++ repeat: ++ assert (! bh); + gdp = NULL; + i = 0; + +@@ -213,7 +217,7 @@ repeat: + return 0; + } + +- bh = bptr (gdp->bg_inode_bitmap); ++ bh = disk_cache_block_ref (gdp->bg_inode_bitmap); + if ((inum = + find_first_zero_bit ((unsigned long *) bh, sblock->s_inodes_per_group)) + < sblock->s_inodes_per_group) +@@ -221,12 +225,17 @@ repeat: + if (set_bit (inum, bh)) + { + ext2_warning ("bit already set for inode %d", inum); ++ disk_cache_block_deref (bh); ++ bh = 0; + goto repeat; + } + record_global_poke (bh); ++ bh = 0; + } + else + { ++ disk_cache_block_deref (bh); ++ bh = 0; + if (gdp->bg_free_inodes_count != 0) + { + ext2_error ("free inodes count corrupted in group %d", i); +@@ -248,15 +257,25 @@ repeat: + gdp->bg_free_inodes_count--; + if (S_ISDIR (mode)) + gdp->bg_used_dirs_count++; ++ disk_cache_block_ref_ptr (gdp); + record_global_poke (gdp); + + sblock->s_free_inodes_count--; + sblock_dirty = 1; + + sync_out: ++ assert (! bh); + spin_unlock (&global_lock); + alloc_sync (0); + ++ /* Make sure the coming read_node won't complain about bad ++ fields. */ ++ { ++ struct ext2_inode *di = dino_ref (inum); ++ memset (di, 0, sizeof *di); ++ dino_deref (di); ++ } ++ + return inum; + } + +@@ -354,10 +373,12 @@ ext2_count_free_inodes () + gdp = NULL; + for (i = 0; i < groups_count; i++) + { ++ void *bh; + gdp = group_desc (i); + desc_count += gdp->bg_free_inodes_count; +- x = count_free (bptr (gdp->bg_inode_bitmap), +- sblock->s_inodes_per_group / 8); ++ bh = disk_cache_block_ref (gdp->bg_inode_bitmap); ++ x = count_free (bh, sblock->s_inodes_per_group / 8); ++ disk_cache_block_deref (bh); + ext2_debug ("group %d: stored = %d, counted = %lu", + i, gdp->bg_free_inodes_count, x); + bitmap_count += x; +@@ -387,10 +408,12 @@ ext2_check_inodes_bitmap () + gdp = NULL; + for (i = 0; i < groups_count; i++) + { ++ void *bh; + gdp = group_desc (i); + desc_count += gdp->bg_free_inodes_count; +- x = count_free (bptr (gdp->bg_inode_bitmap), +- sblock->s_inodes_per_group / 8); ++ bh = disk_cache_block_ref (gdp->bg_inode_bitmap); ++ x = count_free (bh, sblock->s_inodes_per_group / 8); ++ disk_cache_block_deref (bh); + if (gdp->bg_free_inodes_count != x) + ext2_error ("wrong free inodes count in group %d, " + "stored = %d, counted = %lu", +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ext2fs/inode.c hurd/ext2fs/inode.c +--- ../cvs/hurd/ext2fs/inode.c 2002-10-09 02:10:09.000000000 +0300 ++++ hurd/ext2fs/inode.c 2004-09-25 17:37:39.000000000 +0300 +@@ -1,6 +1,6 @@ + /* Inode management routines + +- Copyright (C) 1994,95,96,97,98,99,2000,01,02 Free Software Foundation, Inc. ++ Copyright (C) 1994,95,96,97,98,99,2000,01,02,04 Free Software Foundation, Inc. + + Converted for ext2fs by Miles Bader <miles@gnu.org> + +@@ -91,7 +91,7 @@ diskfs_cached_lookup (ino_t inum, struct + dn->dir_idx = 0; + dn->pager = 0; + rwlock_init (&dn->alloc_lock); +- pokel_init (&dn->indir_pokel, diskfs_disk_pager, disk_image); ++ pokel_init (&dn->indir_pokel, diskfs_disk_pager, disk_cache); + + /* Create the new node. */ + np = diskfs_make_node (dn); +@@ -200,13 +200,17 @@ read_node (struct node *np) + error_t err; + struct stat *st = &np->dn_stat; + struct disknode *dn = np->dn; +- struct ext2_inode *di = dino (np->cache_id); ++ struct ext2_inode *di; + struct ext2_inode_info *info = &dn->info; + ++ ext2_debug ("(%d)", np->cache_id); ++ + err = diskfs_catch_exception (); + if (err) + return err; + ++ di = dino_ref (np->cache_id); ++ + st->st_fstype = FSTYPE_EXT2FS; + st->st_fsid = getpid (); /* This call is very cheap. */ + st->st_ino = np->cache_id; +@@ -275,7 +279,9 @@ read_node (struct node *np) + info->i_high_size = di->i_size_high; + if (info->i_high_size) /* XXX */ + { ++ dino_deref (di); + ext2_warning ("cannot handle large file inode %Ld", np->cache_id); ++ diskfs_end_catch_exception (); + return EFBIG; + } + } +@@ -297,20 +303,12 @@ read_node (struct node *np) + } + dn->info_i_translator = di->i_translator; + ++ dino_deref (di); + diskfs_end_catch_exception (); + + if (S_ISREG (st->st_mode) || S_ISDIR (st->st_mode) + || (S_ISLNK (st->st_mode) && st->st_blocks)) +- { +- unsigned offset; +- +- np->allocsize = np->dn_stat.st_size; +- +- /* Round up to a block multiple. */ +- offset = np->allocsize & ((1 << log2_block_size) - 1); +- if (offset > 0) +- np->allocsize += block_size - offset; +- } ++ np->allocsize = round_block (np->dn_stat.st_size); + else + /* Allocsize should be zero for anything except directories, files, and + long symlinks. These are the only things allowed to have any blocks +@@ -398,7 +396,9 @@ write_node (struct node *np) + { + error_t err; + struct stat *st = &np->dn_stat; +- struct ext2_inode *di = dino (np->cache_id); ++ struct ext2_inode *di; ++ ++ ext2_debug ("(%d)", np->cache_id); + + if (np->dn->info.i_prealloc_count) + ext2_discard_prealloc (np); +@@ -409,12 +409,14 @@ write_node (struct node *np) + + assert (!diskfs_readonly); + +- ext2_debug ("writing inode %d to disk", np->cache_id); ++ ext2_debug ("writing inode %Ld to disk", np->cache_id); + + err = diskfs_catch_exception (); + if (err) + return NULL; + ++ di = dino_ref (np->cache_id); ++ + di->i_generation = st->st_gen; + + /* We happen to know that the stat mode bits are the same +@@ -490,6 +492,7 @@ write_node (struct node *np) + diskfs_end_catch_exception (); + np->dn_stat_dirty = 0; + ++ /* Leave invoking dino_deref (di) to the caller. */ + return di; + } + else +@@ -649,7 +652,7 @@ diskfs_set_translator (struct node *np, + if (err) + return err; + +- di = dino (np->cache_id); ++ di = dino_ref (np->cache_id); + blkno = di->i_translator; + + if (namelen && !blkno) +@@ -662,6 +665,7 @@ diskfs_set_translator (struct node *np, + 0, 0, 0); + if (blkno == 0) + { ++ dino_deref (di); + diskfs_end_catch_exception (); + return ENOSPC; + } +@@ -685,15 +689,20 @@ diskfs_set_translator (struct node *np, + np->dn_stat.st_mode &= ~S_IPTRANS; + np->dn_set_ctime = 1; + } ++ else ++ dino_deref (di); + + if (namelen) + { ++ void *blkptr; ++ + buf[0] = namelen & 0xFF; + buf[1] = (namelen >> 8) & 0xFF; +- bcopy (name, buf + 2, namelen); ++ memcpy (buf + 2, name, namelen); + +- bcopy (buf, bptr (blkno), block_size); +- record_global_poke (bptr (blkno)); ++ blkptr = disk_cache_block_ref (blkno); ++ memcpy (blkptr, buf, block_size); ++ record_global_poke (blkptr); + + np->dn_stat.st_mode |= S_IPTRANS; + np->dn_set_ctime = 1; +@@ -711,7 +720,7 @@ diskfs_get_translator (struct node *np, + error_t err = 0; + daddr_t blkno; + unsigned datalen; +- const void *transloc; ++ void *transloc; + + assert (sblock->s_creator_os == EXT2_OS_HURD); + +@@ -719,9 +728,11 @@ diskfs_get_translator (struct node *np, + if (err) + return err; + +- blkno = (dino (np->cache_id))->i_translator; ++ struct ext2_inode *di = dino_ref (np->cache_id); ++ blkno = di->i_translator; ++ dino_deref (di); + assert (blkno); +- transloc = bptr (blkno); ++ transloc = disk_cache_block_ref (blkno); + + datalen = + ((unsigned char *)transloc)[0] + (((unsigned char *)transloc)[1] << 8); +@@ -736,6 +747,7 @@ diskfs_get_translator (struct node *np, + memcpy (*namep, transloc + 2, datalen); + } + ++ disk_cache_block_deref (transloc); + diskfs_end_catch_exception (); + + *namelen = datalen; +@@ -757,7 +769,7 @@ write_symlink (struct node *node, const + + assert (node->dn_stat.st_blocks == 0); + +- bcopy (target, node->dn->info.i_data, len); ++ memcpy (node->dn->info.i_data, target, len); + node->dn_stat.st_size = len - 1; + node->dn_set_ctime = 1; + node->dn_set_mtime = 1; +@@ -774,7 +786,7 @@ read_symlink (struct node *node, char *t + + assert (node->dn_stat.st_size < MAX_INODE_SYMLINK); + +- bcopy (node->dn->info.i_data, target, node->dn_stat.st_size); ++ memcpy (target, node->dn->info.i_data, node->dn_stat.st_size); + return 0; + } + +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ext2fs/pager.c hurd/ext2fs/pager.c +--- ../cvs/hurd/ext2fs/pager.c 2002-06-12 00:38:01.000000000 +0300 ++++ hurd/ext2fs/pager.c 2004-09-30 14:41:16.000000000 +0300 +@@ -1,6 +1,6 @@ + /* Pager for ext2fs + +- Copyright (C) 1994,95,96,97,98,99,2000,02 Free Software Foundation, Inc. ++ Copyright (C) 1994,95,96,97,98,99,2000,02,04 Free Software Foundation, Inc. + + Converted for ext2fs by Miles Bader <miles@gnu.org> + +@@ -18,17 +18,18 @@ + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + ++#include <unistd.h> + #include <string.h> + #include <errno.h> + #include <hurd/store.h> + #include "ext2fs.h" + ++/* XXX */ ++#include "../libpager/priv.h" ++ + /* A ports bucket to hold pager ports. */ + struct port_bucket *pager_bucket; + +-/* Mapped image of the disk. */ +-void *disk_image; +- + spin_lock_t node_to_page_lock = SPIN_LOCK_INITIALIZER; + + #ifdef DONT_CACHE_MEMORY_OBJECTS +@@ -163,6 +164,9 @@ file_pager_read_page (struct node *node, + block_t pending_blocks = 0; + int num_pending_blocks = 0; + ++ ext2_debug ("reading inode %Ld page %u[%d]", ++ node->cache_id, page, vm_page_size); ++ + /* Read the NUM_PENDING_BLOCKS blocks in PENDING_BLOCKS, into the buffer + pointed to by BUF (allocating it if necessary) at offset OFFS. OFFS in + adjusted by the amount read, and NUM_PENDING_BLOCKS is zeroed. Any read +@@ -171,7 +175,8 @@ file_pager_read_page (struct node *node, + { + if (num_pending_blocks > 0) + { +- block_t dev_block = pending_blocks << log2_dev_blocks_per_fs_block; ++ store_offset_t dev_block = (store_offset_t) pending_blocks ++ << log2_dev_blocks_per_fs_block; + size_t amount = num_pending_blocks << log2_block_size; + /* The buffer we try to read into; on the first read, we pass in a + size of zero, so that the read is guaranteed to allocate a new +@@ -198,7 +203,7 @@ file_pager_read_page (struct node *node, + else + /* We've already got some buffer, so copy into it. */ + { +- bcopy (new_buf, *buf + offs, new_len); ++ memcpy (*buf + offs, new_buf, new_len); + free_page_buf (new_buf); /* Return NEW_BUF to our pool. */ + STAT_INC (file_pagein_freed_bufs); + } +@@ -254,7 +259,7 @@ file_pager_read_page (struct node *node, + break; + STAT_INC (file_pagein_alloced_bufs); + } +- bzero (*buf + offs, block_size); ++ memset (*buf + offs, 0, block_size); + offs += block_size; + } + else +@@ -295,16 +300,17 @@ pending_blocks_write (struct pending_blo + if (pb->num > 0) + { + error_t err; +- block_t dev_block = pb->block << log2_dev_blocks_per_fs_block; ++ store_offset_t dev_block = (store_offset_t) pb->block ++ << log2_dev_blocks_per_fs_block; + size_t length = pb->num << log2_block_size, amount; + +- ext2_debug ("writing block %u[%ld]", pb->block, pb->num); ++ ext2_debug ("writing block %u[%Ld]", pb->block, pb->num); + + if (pb->offs > 0) + /* Put what we're going to write into a page-aligned buffer. */ + { + void *page_buf = get_page_buf (); +- bcopy (pb->buf + pb->offs, (void *)page_buf, length); ++ memcpy ((void *)page_buf, pb->buf + pb->offs, length); + err = store_write (store, dev_block, page_buf, length, &amount); + free_page_buf (page_buf); + } +@@ -357,7 +363,7 @@ pending_blocks_add (struct pending_block + return 0; + } + +-/* Write one page for the pager backing NODE, at offset PAGE, into BUF. This ++/* Write one page for the pager backing NODE, at OFFSET, into BUF. This + may need to write several filesystem blocks to satisfy one page, and tries + to consolidate the i/o if possible. */ + static error_t +@@ -381,7 +387,7 @@ file_pager_write_page (struct node *node + else if (offset + left > node->allocsize) + left = node->allocsize - offset; + +- ext2_debug ("writing inode %d page %d[%d]", node->cache_id, offset, left); ++ ext2_debug ("writing inode %Ld page %u[%d]", node->cache_id, offset, left); + + STAT_INC (file_pageouts); + +@@ -409,16 +415,26 @@ disk_pager_read_page (vm_offset_t page, + { + error_t err; + size_t length = vm_page_size, read = 0; +- vm_size_t dev_end = store->size; ++ store_offset_t offset = page, dev_end = store->size; + +- if (page + vm_page_size > dev_end) +- length = dev_end - page; ++ mutex_lock (&disk_cache_lock); ++ int index = offset >> log2_block_size; ++ offset = ((store_offset_t) disk_cache_info[index].block << log2_block_size) ++ + offset % block_size; ++ disk_cache_info[index].flags |= DC_INCORE; ++ disk_cache_info[index].flags &=~ DC_UNTOUCHED; ++ ext2_debug ("(%Ld)", offset >> log2_block_size); ++ mutex_unlock (&disk_cache_lock); + +- err = store_read (store, page >> store->log2_block_size, length, buf, &read); ++ if (offset + vm_page_size > dev_end) ++ length = dev_end - offset; ++ ++ err = store_read (store, offset >> store->log2_block_size, length, ++ buf, &read); + if (read != length) + return EIO; + if (!err && length != vm_page_size) +- bzero ((void *)(*buf + length), vm_page_size - length); ++ memset ((void *)(*buf + length), 0, vm_page_size - length); + + *writelock = 0; + +@@ -430,26 +446,32 @@ disk_pager_write_page (vm_offset_t page, + { + error_t err = 0; + size_t length = vm_page_size, amount; +- vm_size_t dev_end = store->size; ++ store_offset_t offset = page, dev_end = store->size; ++ ++ mutex_lock (&disk_cache_lock); ++ int index = offset >> log2_block_size; ++ assert (disk_cache_info[index].block != DC_NO_BLOCK); ++ offset = ((store_offset_t) disk_cache_info[index].block << log2_block_size) ++ + offset % block_size; ++ mutex_unlock (&disk_cache_lock); + +- if (page + vm_page_size > dev_end) +- length = dev_end - page; ++ if (offset + vm_page_size > dev_end) ++ length = dev_end - offset; + +- ext2_debug ("writing disk page %d[%d]", page, length); ++ ext2_debug ("writing disk page %Ld[%d]", offset, length); + + STAT_INC (disk_pageouts); + + if (modified_global_blocks) + /* Be picky about which blocks in a page that we write. */ + { +- vm_offset_t offs = page; + struct pending_blocks pb; + + pending_blocks_init (&pb, buf); + + while (length > 0 && !err) + { +- block_t block = boffs_block (offs); ++ block_t block = boffs_block (offset); + + /* We don't clear the block modified bit here because this paging + write request may not be the same one that actually set the bit, +@@ -467,7 +489,7 @@ disk_pager_write_page (vm_offset_t page, + /* Otherwise just skip it. */ + err = pending_blocks_skip (&pb); + +- offs += block_size; ++ offset += block_size; + length -= block_size; + } + +@@ -476,7 +498,7 @@ disk_pager_write_page (vm_offset_t page, + } + else + { +- err = store_write (store, page >> store->log2_block_size, ++ err = store_write (store, offset >> store->log2_block_size, + buf, length, &amount); + if (!err && length != amount) + err = EIO; +@@ -484,6 +506,18 @@ disk_pager_write_page (vm_offset_t page, + + return err; + } ++ ++static void ++disk_pager_notify_evict (vm_offset_t page) ++{ ++ int index = page >> log2_block_size; ++ ++ ext2_debug ("(block %u)", index); ++ ++ mutex_lock (&disk_cache_lock); ++ disk_cache_info[index].flags &= ~DC_INCORE; ++ mutex_unlock (&disk_cache_lock); ++} + + /* Satisfy a pager read request for either the disk pager or file pager + PAGER, to the page at offset PAGE into BUF. WRITELOCK should be set if +@@ -493,9 +527,11 @@ pager_read_page (struct user_pager_info + vm_address_t *buf, int *writelock) + { + if (pager->type == DISK) +- return disk_pager_read_page (page, (void **)buf, writelock); ++ return disk_pager_read_page (page, (void **)buf, ++ writelock); + else +- return file_pager_read_page (pager->node, page, (void **)buf, writelock); ++ return file_pager_read_page (pager->node, page, (void **)buf, ++ writelock); + } + + /* Satisfy a pager write request for either the disk pager or file pager +@@ -509,6 +545,14 @@ pager_write_page (struct user_pager_info + else + return file_pager_write_page (pager->node, page, (void *)buf); + } ++ ++void ++pager_notify_evict (struct user_pager_info *pager, vm_offset_t page) ++{ ++ if (pager->type == DISK) ++ disk_pager_notify_evict (page); ++} ++ + + /* Make page PAGE writable, at least up to ALLOCSIZE. This function and + diskfs_grow are the only places that blocks are actually added to the +@@ -558,10 +602,10 @@ pager_unlock_page (struct user_pager_inf + + #ifdef EXT2FS_DEBUG + if (dn->last_page_partially_writable) +- ext2_debug ("made page %u[%lu] in inode %d partially writable", ++ ext2_debug ("made page %u[%Lu] in inode %Ld partially writable", + page, node->allocsize - page, node->cache_id); + else +- ext2_debug ("made page %u[%u] in inode %d writable", ++ ext2_debug ("made page %u[%u] in inode %Ld writable", + page, vm_page_size, node->cache_id); + #endif + +@@ -619,8 +663,8 @@ diskfs_grow (struct node *node, off_t si + block_t old_page_end_block = + round_page (old_size) >> log2_block_size; + +- ext2_debug ("growing inode %d to %lu bytes (from %lu)", node->cache_id, +- new_size, old_size); ++ ext2_debug ("growing inode %Ld to %Lu bytes (from %Lu)", ++ node->cache_id, new_size, old_size); + + if (dn->last_page_partially_writable + && old_page_end_block > end_block) +@@ -656,11 +700,11 @@ diskfs_grow (struct node *node, off_t si + + STAT_INC (file_grows); + +- ext2_debug ("new size: %ld%s.", new_size, ++ ext2_debug ("new size: %Lu%s.", new_size, + dn->last_page_partially_writable + ? " (last page writable)": ""); + if (err) +- ext2_warning ("inode=%Ld, target=%Ld: %s", ++ ext2_warning ("inode=%Ld, target=%Lu: %s", + node->cache_id, new_size, strerror (err)); + + node->allocsize = new_size; +@@ -765,6 +809,369 @@ pager_dropweak (struct user_pager_info * + { + } + ++/* Cached blocks from disk. */ ++void *disk_cache; ++ ++/* DISK_CACHE size in bytes and blocks. */ ++store_offset_t disk_cache_size; ++int disk_cache_blocks; ++ ++/* block num --> pointer to in-memory block */ ++hurd_ihash_t disk_cache_bptr; ++/* Cached blocks' info. */ ++struct disk_cache_info *disk_cache_info; ++/* Hint index for which cache block to reuse next. */ ++int disk_cache_hint; ++/* Lock for these structures. */ ++struct mutex disk_cache_lock; ++/* Fired when a re-association is done. */ ++struct condition disk_cache_reassociation; ++ ++/* Finish mapping initialization. */ ++static void ++disk_cache_init (void) ++{ ++ if (block_size != vm_page_size) ++ ext2_panic ("Block size %d != vm_page_size %d", ++ block_size, vm_page_size); ++ ++ mutex_init (&disk_cache_lock); ++ condition_init (&disk_cache_reassociation); ++ ++ /* Allocate space for block num -> in-memory pointer mapping. */ ++ if (hurd_ihash_create (&disk_cache_bptr, HURD_IHASH_NO_LOCP)) ++ ext2_panic ("Can't allocate memory for disk_pager_bptr"); ++ ++ /* Allocate space for disk cache blocks' info. */ ++ disk_cache_info = malloc ((sizeof *disk_cache_info) * disk_cache_blocks); ++ if (!disk_cache_info) ++ ext2_panic ("Cannot allocate space for disk cache info"); ++ ++ /* Initialize disk_cache_info. */ ++ for (int i = 0; i < disk_cache_blocks; i++) ++ { ++ disk_cache_info[i].block = DC_NO_BLOCK; ++ disk_cache_info[i].flags = 0; ++ disk_cache_info[i].ref_count = 0; ++ } ++ disk_cache_hint = 0; ++ ++ /* Map the superblock and the block group descriptors. */ ++ block_t fixed_first = boffs_block (SBLOCK_OFFS); ++ block_t fixed_last = fixed_first ++ + (round_block ((sizeof *group_desc_image) * groups_count) ++ >> log2_block_size); ++ ext2_debug ("%d-%d\n", fixed_first, fixed_last); ++ assert (fixed_last - fixed_first + 1 <= (block_t)disk_cache_blocks + 3); ++ for (block_t i = fixed_first; i <= fixed_last; i++) ++ { ++ disk_cache_block_ref (i); ++ assert (disk_cache_info[i-fixed_first].block == i); ++ disk_cache_info[i-fixed_first].flags |= DC_FIXED; ++ } ++} ++ ++static void ++disk_cache_return_unused (void) ++{ ++ int index; ++ ++ /* XXX: Touch all pages. It seems that sometimes GNU Mach "forgets" ++ to notify us about evicted pages. Disk cache must be ++ unlocked. */ ++ for (vm_offset_t i = 0; i < disk_cache_size; i += vm_page_size) ++ *(volatile char *)(disk_cache + i); ++ ++ /* Release some references to cached blocks. */ ++ pokel_sync (&global_pokel, 1); ++ ++ /* Return unused pages that are in core. */ ++ int pending_begin = -1, pending_end = -1; ++ mutex_lock (&disk_cache_lock); ++ for (index = 0; index < disk_cache_blocks; index++) ++ if (! (disk_cache_info[index].flags & (DC_DONT_REUSE & ~DC_INCORE)) ++ && ! disk_cache_info[index].ref_count) ++ { ++ ext2_debug ("return %u -> %d", ++ disk_cache_info[index].block, index); ++ if (index != pending_end) ++ { ++ /* Return previous region, if there is such, ... */ ++ if (pending_end >= 0) ++ { ++ mutex_unlock (&disk_cache_lock); ++ pager_return_some (diskfs_disk_pager, ++ pending_begin * vm_page_size, ++ (pending_end - pending_begin) ++ * vm_page_size, ++ 1); ++ mutex_lock (&disk_cache_lock); ++ } ++ /* ... and start new region. */ ++ pending_begin = index; ++ } ++ pending_end = index + 1; ++ } ++ ++ mutex_unlock (&disk_cache_lock); ++ ++ /* Return last region, if there is such. */ ++ if (pending_end >= 0) ++ pager_return_some (diskfs_disk_pager, ++ pending_begin * vm_page_size, ++ (pending_end - pending_begin) * vm_page_size, ++ 1); ++ else ++ { ++ printf ("ext2fs: disk cache is starving\n"); ++ ++ /* Give it some time. This should happen rarely. */ ++ sleep (1); ++ } ++} ++ ++/* Map block and return pointer to it. */ ++void * ++disk_cache_block_ref (block_t block) ++{ ++ int index; ++ void *bptr; ++ ++ assert (0 <= block && block < store->size >> log2_block_size); ++ ++ ext2_debug ("(%u)", block); ++ ++ mutex_lock (&disk_cache_lock); ++ ++ bptr = hurd_ihash_find (disk_cache_bptr, block); ++ if (bptr) ++ /* Already mapped. */ ++ { ++ index = bptr_index (bptr); ++ ++ /* In process of re-associating? */ ++ if (disk_cache_info[index].flags & DC_UNTOUCHED) ++ { ++ /* Wait re-association to finish. */ ++ condition_wait (&disk_cache_reassociation, &disk_cache_lock); ++ mutex_unlock (&disk_cache_lock); ++ ++#if 0 ++ printf ("Re-association -- wait finished.\n"); ++#endif ++ ++ /* Try again. */ ++ return disk_cache_block_ref (block); /* tail recursion */ ++ } ++ ++ /* Just increment reference and return. */ ++ assert (disk_cache_info[index].ref_count + 1 ++ > disk_cache_info[index].ref_count); ++ disk_cache_info[index].ref_count++; ++ ++ ext2_debug ("cached %u -> %d (ref_count = %d, flags = 0x%x, ptr = %p)", ++ disk_cache_info[index].block, index, ++ disk_cache_info[index].ref_count, ++ disk_cache_info[index].flags, bptr); ++ ++ mutex_unlock (&disk_cache_lock); ++ ++ return bptr; ++ } ++ ++ /* Search for a block that is not in core and is not referenced. */ ++ index = disk_cache_hint; ++ while ((disk_cache_info[index].flags & DC_DONT_REUSE) ++ || (disk_cache_info[index].ref_count)) ++ { ++ ext2_debug ("reject %u -> %d (ref_count = %d, flags = 0x%x)", ++ disk_cache_info[index].block, index, ++ disk_cache_info[index].ref_count, ++ disk_cache_info[index].flags); ++ ++ /* Just move to next block. */ ++ index++; ++ if (index >= disk_cache_blocks) ++ index -= disk_cache_blocks; ++ ++ /* If we return to where we started, than there is no suitable ++ block. */ ++ if (index == disk_cache_hint) ++ break; ++ } ++ ++ /* The next place in the disk cache becomes the current hint. */ ++ disk_cache_hint = index + 1; ++ if (disk_cache_hint >= disk_cache_blocks) ++ disk_cache_hint -= disk_cache_blocks; ++ ++ /* Is suitable place found? */ ++ if ((disk_cache_info[index].flags & DC_DONT_REUSE) ++ || disk_cache_info[index].ref_count) ++ /* No place is found. Try to release some blocks and try ++ again. */ ++ { ++ ext2_debug ("flush %u -> %d", disk_cache_info[index].block, index); ++ ++ mutex_unlock (&disk_cache_lock); ++ ++ disk_cache_return_unused (); ++ ++ return disk_cache_block_ref (block); /* tail recursion */ ++ } ++ ++ /* Suitable place is found. */ ++ ++ /* Calculate pointer to data. */ ++ bptr = (char *)disk_cache + (index << log2_block_size); ++ ext2_debug ("map %u -> %d (%p)", block, index, bptr); ++ ++ /* This pager_return_some is used only to set PM_FORCEREAD for the ++ page. DC_UNTOUCHED is set so that we catch if someone has ++ referenced the block while we didn't hold disk_cache_lock. */ ++ disk_cache_info[index].flags |= DC_UNTOUCHED; ++ ++#if 0 /* XXX: Let's see if this is needed at all. */ ++ ++ mutex_unlock (&disk_cache_lock); ++ pager_return_some (diskfs_disk_pager, bptr - disk_cache, vm_page_size, 1); ++ mutex_lock (&disk_cache_lock); ++ ++ /* Has someone used our bptr? Has someone mapped requested block ++ while we have unlocked disk_cache_lock? If so, environment has ++ changed and we have to restart operation. */ ++ if ((! (disk_cache_info[index].flags & DC_UNTOUCHED)) ++ || hurd_ihash_find (disk_cache_bptr, block)) ++ { ++ mutex_unlock (&disk_cache_lock); ++ return disk_cache_block_ref (block); /* tail recursion */ ++ } ++ ++#elif 0 ++ ++ /* XXX: Use libpager internals. */ ++ ++ mutex_lock (&diskfs_disk_pager->interlock); ++ int page = (bptr - disk_cache) / vm_page_size; ++ assert (page >= 0); ++ int is_incore = (page < diskfs_disk_pager->pagemapsize ++ && (diskfs_disk_pager->pagemap[page] & PM_INCORE)); ++ mutex_unlock (&diskfs_disk_pager->interlock); ++ if (is_incore) ++ { ++ mutex_unlock (&disk_cache_lock); ++ printf ("INCORE\n"); ++ return disk_cache_block_ref (block); /* tail recursion */ ++ } ++ ++#endif ++ ++ /* Re-associate. */ ++ if (disk_cache_info[index].block != DC_NO_BLOCK) ++ /* Remove old association. */ ++ hurd_ihash_remove (disk_cache_bptr, disk_cache_info[index].block); ++ /* New association. */ ++ if (hurd_ihash_add (disk_cache_bptr, block, bptr)) ++ ext2_panic ("Couldn't hurd_ihash_add new disk block"); ++ assert (! (disk_cache_info[index].flags & DC_DONT_REUSE & ~DC_UNTOUCHED)); ++ disk_cache_info[index].block = block; ++ assert (! disk_cache_info[index].ref_count); ++ disk_cache_info[index].ref_count = 1; ++ ++ /* All data structures are set up. */ ++ mutex_unlock (&disk_cache_lock); ++ ++ /* Try to read page. */ ++ *(volatile char *) bptr; ++ ++ /* Check if it's actually read. */ ++ mutex_lock (&disk_cache_lock); ++ if (disk_cache_info[index].flags & DC_UNTOUCHED) ++ /* It's not read. */ ++ { ++ /* Remove newly created association. */ ++ hurd_ihash_remove (disk_cache_bptr, block); ++ disk_cache_info[index].block = DC_NO_BLOCK; ++ disk_cache_info[index].flags &=~ DC_UNTOUCHED; ++ disk_cache_info[index].ref_count = 0; ++ mutex_unlock (&disk_cache_lock); ++ ++ /* Prepare next time association of this page to succeed. */ ++ pager_flush_some (diskfs_disk_pager, bptr - disk_cache, ++ vm_page_size, 0); ++ ++#if 0 ++ printf ("Re-association failed.\n"); ++#endif ++ ++ /* Try again. */ ++ return disk_cache_block_ref (block); /* tail recursion */ ++ } ++ mutex_unlock (&disk_cache_lock); ++ ++ /* Re-association was successful. */ ++ condition_broadcast (&disk_cache_reassociation); ++ ++ ext2_debug ("(%u) = %p", block, bptr); ++ return bptr; ++} ++ ++void ++disk_cache_block_ref_ptr (void *ptr) ++{ ++ int index; ++ ++ mutex_lock (&disk_cache_lock); ++ index = bptr_index (ptr); ++ assert (disk_cache_info[index].ref_count >= 1); ++ assert (disk_cache_info[index].ref_count + 1 ++ > disk_cache_info[index].ref_count); ++ disk_cache_info[index].ref_count++; ++ assert (! (disk_cache_info[index].flags & DC_UNTOUCHED)); ++ ext2_debug ("(%p) (ref_count = %d, flags = 0x%x)", ++ ptr, ++ disk_cache_info[index].ref_count, ++ disk_cache_info[index].flags); ++ mutex_unlock (&disk_cache_lock); ++} ++ ++void ++disk_cache_block_deref (void *ptr) ++{ ++ int index; ++ ++ assert (disk_cache <= ptr && ptr <= disk_cache + disk_cache_size); ++ ++ mutex_lock (&disk_cache_lock); ++ index = bptr_index (ptr); ++ ext2_debug ("(%p) (ref_count = %d, flags = 0x%x)", ++ ptr, ++ disk_cache_info[index].ref_count - 1, ++ disk_cache_info[index].flags); ++ assert (! (disk_cache_info[index].flags & DC_UNTOUCHED)); ++ assert (disk_cache_info[index].ref_count >= 1); ++ disk_cache_info[index].ref_count--; ++ mutex_unlock (&disk_cache_lock); ++} ++ ++/* Not used. */ ++int ++disk_cache_block_is_ref (block_t block) ++{ ++ int ref; ++ void *ptr; ++ ++ mutex_lock (&disk_cache_lock); ++ ptr = hurd_ihash_find (disk_cache_bptr, block); ++ if (! ptr) ++ ref = 0; ++ else /* XXX: Should check for DC_UNTOUCHED too. */ ++ ref = disk_cache_info[bptr_index (ptr)].ref_count; ++ mutex_unlock (&disk_cache_lock); ++ ++ return ref; ++} ++ + /* Create the DISK pager. */ + void + create_disk_pager (void) +@@ -774,8 +1181,12 @@ create_disk_pager (void) + ext2_panic ("can't create disk pager: %s", strerror (errno)); + upi->type = DISK; + pager_bucket = ports_create_bucket (); +- diskfs_start_disk_pager (upi, pager_bucket, MAY_CACHE, store->size, +- &disk_image); ++ get_hypermetadata (); ++ disk_cache_blocks = DISK_CACHE_BLOCKS; ++ disk_cache_size = disk_cache_blocks << log2_block_size; ++ diskfs_start_disk_pager (upi, pager_bucket, MAY_CACHE, 1, ++ disk_cache_size, &disk_cache); ++ disk_cache_init (); + } + + /* Call this to create a FILE_DATA pager and return a send right. +@@ -815,7 +1226,7 @@ diskfs_get_filemap (struct node *node, v + diskfs_nref_light (node); + node->dn->pager = + pager_create (upi, pager_bucket, MAY_CACHE, +- MEMORY_OBJECT_COPY_DELAY); ++ MEMORY_OBJECT_COPY_DELAY, 0); + if (node->dn->pager == 0) + { + diskfs_nrele_light (node); +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ext2fs/pokel.c hurd/ext2fs/pokel.c +--- ../cvs/hurd/ext2fs/pokel.c 1996-01-16 00:28:56.000000000 +0200 ++++ hurd/ext2fs/pokel.c 2004-09-25 17:37:39.000000000 +0300 +@@ -1,6 +1,6 @@ + /* A data structure to remember modifications to a memory region + +- Copyright (C) 1995 Free Software Foundation, Inc. ++ Copyright (C) 1995, 1996, 2004 Free Software Foundation, Inc. + + Written by Miles Bader <miles@gnu.ai.mit.edu> + +@@ -67,12 +67,27 @@ pokel_add (struct pokel *pokel, void *lo + vm_offset_t p_offs = pl->offset; + vm_size_t p_end = p_offs + pl->length; + +- if (p_offs == offset && p_end == end) +- break; ++ if (p_offs <= offset && end <= p_end) ++ { ++ if (pokel->image == disk_cache) ++ for (vm_offset_t i = offset; i < end; i += block_size) ++ disk_cache_block_deref (disk_cache + i); ++ ++ break; ++ } + else if (p_end >= offset && end >= p_offs) + { + pl->offset = offset < p_offs ? offset : p_offs; + pl->length = (end > p_end ? end : p_end) - pl->offset; ++ ++ if (pokel->image == disk_cache) ++ { ++ vm_offset_t i_begin = p_offs > offset ? p_offs : offset; ++ vm_offset_t i_end = p_end < end ? p_end : end; ++ for (vm_offset_t i = i_begin; i < i_end; i += block_size) ++ disk_cache_block_deref (disk_cache + i); ++ } ++ + ext2_debug ("extended 0x%x[%ul] to 0x%x[%ul]", + p_offs, p_end - p_offs, pl->offset, pl->length); + break; +@@ -106,18 +121,28 @@ void + _pokel_exec (struct pokel *pokel, int sync, int wait) + { + struct poke *pl, *pokes, *last = NULL; +- ++ + spin_lock (&pokel->lock); + pokes = pokel->pokes; + pokel->pokes = NULL; + spin_unlock (&pokel->lock); + + for (pl = pokes; pl; last = pl, pl = pl->next) +- if (sync) +- { +- ext2_debug ("syncing 0x%x[%ul]", pl->offset, pl->length); +- pager_sync_some (pokel->pager, pl->offset, pl->length, wait); +- } ++ { ++ if (sync) ++ { ++ ext2_debug ("syncing 0x%x[%ul]", pl->offset, pl->length); ++ pager_sync_some (pokel->pager, pl->offset, pl->length, wait); ++ } ++ ++ if (pokel->image == disk_cache) ++ { ++ vm_offset_t begin = trunc_block (pl->offset); ++ vm_offset_t end = round_block (pl->offset + pl->length); ++ for (vm_offset_t i = begin; i != end; i += block_size) ++ disk_cache_block_deref (pokel->image + i); ++ } ++ } + + if (last) + { +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ext2fs/truncate.c hurd/ext2fs/truncate.c +--- ../cvs/hurd/ext2fs/truncate.c 2000-12-03 06:41:37.000000000 +0200 ++++ hurd/ext2fs/truncate.c 2004-09-25 17:37:39.000000000 +0300 +@@ -1,6 +1,6 @@ + /* File truncation + +- Copyright (C) 1995,96,97,99,2000 Free Software Foundation, Inc. ++ Copyright (C) 1995,96,97,99,2000,04 Free Software Foundation, Inc. + + Written by Miles Bader <miles@gnu.org> + +@@ -124,7 +124,7 @@ trunc_indirect (struct node *node, block + { + unsigned index; + int modified = 0, all_freed = 1; +- block_t *ind_bh = (block_t *)bptr (*p); ++ block_t *ind_bh = (block_t *)disk_cache_block_ref (*p); + unsigned first = end < offset ? 0 : end - offset; + + for (index = first; index < addr_per_block; index++) +@@ -139,11 +139,16 @@ trunc_indirect (struct node *node, block + + if (first == 0 && all_freed) + { +- pager_flush_some (diskfs_disk_pager, boffs (*p), block_size, 1); ++ pager_flush_some (diskfs_disk_pager, ++ bptr_index (ind_bh) << log2_block_size, ++ block_size, 1); + free_block_run_free_ptr (fbr, p); ++ disk_cache_block_deref (ind_bh); + } + else if (modified) + record_indir_poke (node, ind_bh); ++ else ++ disk_cache_block_deref (ind_bh); + } + } + +@@ -218,7 +223,7 @@ poke_pages (memory_object_t obj, vm_offs + /* Flush all the data past the new size from the kernel. Also force any + delayed copies of this data to take place immediately. (We are implicitly + changing the data to zeros and doing it without the kernel's immediate +- knowledge; accordingl we must help out the kernel thusly.) */ ++ knowledge; accordingly we must help out the kernel thusly.) */ + static void + force_delayed_copies (struct node *node, off_t length) + { +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/fatfs/pager.c hurd/fatfs/pager.c +--- ../cvs/hurd/fatfs/pager.c 2003-07-29 01:42:26.000000000 +0300 ++++ hurd/fatfs/pager.c 2004-09-29 17:49:28.000000000 +0300 +@@ -1,5 +1,5 @@ + /* pager.c - Pager for fatfs. +- Copyright (C) 1997, 1999, 2002, 2003 Free Software Foundation, Inc. ++ Copyright (C) 1997, 1999, 2002, 2003, 2004 Free Software Foundation, Inc. + Written by Thomas Bushnell, n/BSG and Marcus Brinkmann. + + This file is part of the GNU Hurd. +@@ -596,6 +596,13 @@ pager_unlock_page (struct user_pager_inf + return 0; + } + ++void ++pager_notify_evict (struct user_pager_info *pager, ++ vm_offset_t page) ++{ ++ assert (!"unrequested notification on eviction"); ++} ++ + /* Grow the disk allocated to locked node NODE to be at least SIZE + bytes, and set NODE->allocsize to the actual allocated size. (If + the allocated size is already SIZE bytes, do nothing.) CRED +@@ -752,7 +759,7 @@ create_fat_pager (void) + struct user_pager_info *upi = malloc (sizeof (struct user_pager_info)); + upi->type = FAT; + pager_bucket = ports_create_bucket (); +- diskfs_start_disk_pager (upi, pager_bucket, MAY_CACHE, ++ diskfs_start_disk_pager (upi, pager_bucket, MAY_CACHE, 0, + bytes_per_sector * sectors_per_fat, + &fat_image); + } +@@ -794,7 +801,7 @@ diskfs_get_filemap (struct node *node, v + diskfs_nref_light (node); + node->dn->pager = + pager_create (upi, pager_bucket, MAY_CACHE, +- MEMORY_OBJECT_COPY_DELAY); ++ MEMORY_OBJECT_COPY_DELAY, 0); + if (node->dn->pager == 0) + { + diskfs_nrele_light (node); +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/isofs/pager.c hurd/isofs/pager.c +--- ../cvs/hurd/isofs/pager.c 2001-01-07 19:06:26.000000000 +0200 ++++ hurd/isofs/pager.c 2004-09-29 17:49:28.000000000 +0300 +@@ -1,5 +1,5 @@ + /* +- Copyright (C) 1997, 1999 Free Software Foundation, Inc. ++ Copyright (C) 1997, 1999, 2004 Free Software Foundation, Inc. + Written by Thomas Bushnell, n/BSG. + + This file is part of the GNU Hurd. +@@ -94,6 +94,13 @@ pager_unlock_page (struct user_pager_inf + return EROFS; + } + ++void ++pager_notify_evict (struct user_pager_info *pager, ++ vm_offset_t page) ++{ ++ assert (!"unrequested notification on eviction"); ++} ++ + /* Tell how big the file is. */ + error_t + pager_report_extent (struct user_pager_info *pager, +@@ -137,7 +144,7 @@ create_disk_pager (void) + upi->type = DISK; + upi->np = 0; + pager_bucket = ports_create_bucket (); +- diskfs_start_disk_pager (upi, pager_bucket, 1, store->size, &disk_image); ++ diskfs_start_disk_pager (upi, pager_bucket, 1, 0, store->size, &disk_image); + upi->p = diskfs_disk_pager; + } + +@@ -168,7 +175,8 @@ diskfs_get_filemap (struct node *np, vm_ + upi->type = FILE_DATA; + upi->np = np; + diskfs_nref_light (np); +- upi->p = pager_create (upi, pager_bucket, 1, MEMORY_OBJECT_COPY_DELAY); ++ upi->p = pager_create (upi, pager_bucket, 1, ++ MEMORY_OBJECT_COPY_DELAY, 0); + if (upi->p == 0) + { + diskfs_nrele_light (np); +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/libdiskfs/disk-pager.c hurd/libdiskfs/disk-pager.c +--- ../cvs/hurd/libdiskfs/disk-pager.c 2002-05-08 12:56:56.000000000 +0300 ++++ hurd/libdiskfs/disk-pager.c 2004-09-29 17:49:28.000000000 +0300 +@@ -1,5 +1,5 @@ + /* Map the disk image and handle faults accessing it. +- Copyright (C) 1996,97,99,2001,02 Free Software Foundation, Inc. ++ Copyright (C) 1996,97,99,2001,02,04 Free Software Foundation, Inc. + Written by Roland McGrath. + + This program is free software; you can redistribute it and/or +@@ -46,7 +46,8 @@ service_paging_requests (any_t arg) + + void + diskfs_start_disk_pager (struct user_pager_info *upi, +- struct port_bucket *pager_bucket, int may_cache, ++ struct port_bucket *pager_bucket, ++ int may_cache, int notify_on_evict, + size_t size, void **image) + { + error_t err; +@@ -58,7 +59,8 @@ diskfs_start_disk_pager (struct user_pag + + /* Create the pager. */ + diskfs_disk_pager = pager_create (upi, pager_bucket, +- may_cache, MEMORY_OBJECT_COPY_NONE); ++ may_cache, MEMORY_OBJECT_COPY_NONE, ++ notify_on_evict); + assert (diskfs_disk_pager); + + /* Get a port to the disk pager. */ +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/libdiskfs/diskfs-pager.h hurd/libdiskfs/diskfs-pager.h +--- ../cvs/hurd/libdiskfs/diskfs-pager.h 1997-02-05 18:39:19.000000000 +0200 ++++ hurd/libdiskfs/diskfs-pager.h 2004-09-29 17:49:28.000000000 +0300 +@@ -1,5 +1,5 @@ + /* Map the disk image and handle faults accessing it. +- Copyright (C) 1996, 1997 Free Software Foundation, Inc. ++ Copyright (C) 1996, 1997, 2004 Free Software Foundation, Inc. + Written by Roland McGrath. + + This program is free software; you can redistribute it and/or +@@ -33,7 +33,8 @@ + mapped is returned in IMAGE. INFO, PAGER_BUCKET, & MAY_CACHE are passed + to `pager_create'. */ + extern void diskfs_start_disk_pager (struct user_pager_info *info, +- struct port_bucket *pager_bucket, int may_cache, ++ struct port_bucket *pager_bucket, ++ int may_cache, int notify_on_evict, + size_t size, void **image); + + extern struct pager *diskfs_disk_pager; +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/libpager/data-request.c hurd/libpager/data-request.c +--- ../cvs/hurd/libpager/data-request.c 2002-05-08 12:22:14.000000000 +0300 ++++ hurd/libpager/data-request.c 2004-09-28 10:27:33.000000000 +0300 +@@ -1,5 +1,5 @@ + /* Implementation of memory_object_data_request for pager library +- Copyright (C) 1994,95,96,97,2000,02 Free Software Foundation ++ Copyright (C) 1994,95,96,97,2000,02,04 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as +@@ -40,11 +40,11 @@ _pager_seqnos_memory_object_data_request + if (!p) + return EOPNOTSUPP; + +- /* Acquire the right to meddle with the pagemap */ ++ /* Acquire the right to meddle with the pagemap. */ + mutex_lock (&p->interlock); + _pager_wait_for_seqno (p, seqno); + +- /* sanity checks -- we don't do multi-page requests yet. */ ++ /* Sanity checks -- we don't do multi-page requests yet. */ + if (control != p->memobjcntl) + { + printf ("incg data request: wrong control port\n"); +@@ -67,14 +67,16 @@ _pager_seqnos_memory_object_data_request + if (p->pager_state != NORMAL) + { + printf ("pager in wrong state for read\n"); +- _pager_release_seqno (p, seqno); +- mutex_unlock (&p->interlock); +- goto allow_term_out; ++ _pager_allow_termination (p); ++ goto release_out; + } + + err = _pager_pagemap_resize (p, offset + length); + if (err) +- goto release_out; /* Can't do much about the actual error. */ ++ { ++ _pager_allow_termination (p); ++ goto release_out; /* Can't do much about the actual error. */ ++ } + + /* If someone is paging this out right now, the disk contents are + unreliable, so we have to wait. It is too expensive (right now) to +@@ -121,7 +123,8 @@ _pager_seqnos_memory_object_data_request + goto error_read; + + memory_object_data_supply (p->memobjcntl, offset, page, length, 1, +- write_lock ? VM_PROT_WRITE : VM_PROT_NONE, 0, ++ write_lock ? VM_PROT_WRITE : VM_PROT_NONE, ++ p->notify_on_evict ? 1 : 0, + MACH_PORT_NULL); + mutex_lock (&p->interlock); + _pager_mark_object_error (p, offset, length, 0); +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/libpager/data-return.c hurd/libpager/data-return.c +--- ../cvs/hurd/libpager/data-return.c 2002-05-08 12:22:14.000000000 +0300 ++++ hurd/libpager/data-return.c 2004-09-28 10:51:22.000000000 +0300 +@@ -1,5 +1,5 @@ + /* Implementation of memory_object_data_return for pager library +- Copyright (C) 1994,95,96,99,2000,02 Free Software Foundation, Inc. ++ Copyright (C) 1994,95,96,99,2000,02,04 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as +@@ -38,6 +38,7 @@ _pager_do_write_request (mach_port_t obj + { + struct pager *p; + short *pm_entries; ++ char *notified; + int npages, i; + error_t *pagerrs; + struct lock_request *lr; +@@ -71,9 +72,6 @@ _pager_do_write_request (mach_port_t obj + goto release_out; + } + +- if (! dirty) +- goto release_out; +- + if (p->pager_state != NORMAL) + { + printf ("pager in wrong state for write\n"); +@@ -90,6 +88,24 @@ _pager_do_write_request (mach_port_t obj + + pm_entries = &p->pagemap[offset / __vm_page_size]; + ++ notified = alloca (npages * sizeof (*notified)); ++ memset (notified, 0, npages * sizeof (*notified)); ++ ++ if (! dirty && ! kcopy) ++ { ++ if (p->notify_on_evict) ++ for (i = 0; i < npages; i++) ++ notified[i] = ! (pm_entries[i] & PM_PAGEINWAIT); ++ _pager_release_seqno (p, seqno); ++ goto notify; ++ } ++ ++ if (! dirty) ++ { ++ _pager_allow_termination (p); ++ goto release_out; ++ } ++ + /* Make sure there are no other in-progress writes for any of these + pages before we begin. This imposes a little more serialization + than we really have to require (because *all* future writes on +@@ -120,10 +136,6 @@ _pager_do_write_request (mach_port_t obj + for (i = 0; i < npages; i++) + pm_entries[i] |= PM_PAGINGOUT | PM_INIT; + +- if (!kcopy) +- for (i = 0; i < npages; i++) +- pm_entries[i] &= ~PM_INCORE; +- + /* If this write occurs while a lock is pending, record + it. We have to keep this list because a lock request + might come in while we do the I/O; in that case there +@@ -185,8 +197,12 @@ _pager_do_write_request (mach_port_t obj + vm_page_size, 1, + VM_PROT_NONE, 0, MACH_PORT_NULL); + else +- munmap ((caddr_t) (data + (vm_page_size * i)), +- vm_page_size); ++ { ++ munmap ((caddr_t) (data + (vm_page_size * i)), ++ vm_page_size); ++ notified[i] = !! p->notify_on_evict; ++ pm_entries[i] &= ~PM_INCORE; ++ } + + pm_entries[i] &= ~(PM_PAGINGOUT | PM_PAGEINWAIT | PM_WRITEWAIT); + } +@@ -198,10 +214,24 @@ _pager_do_write_request (mach_port_t obj + if (wakeup) + condition_broadcast (&p->wakeup); + ++ notify: + _pager_allow_termination (p); +- + mutex_unlock (&p->interlock); + ++ if (! kcopy) ++ for (i = 0; i < npages; i++) ++ if (notified[i]) ++ { ++ short *pm_entry = &pm_entries[i]; ++ ++ pager_notify_evict (p->upi, offset + (i * vm_page_size)); ++ ++ /* Clear any error that is left. Notification on eviction ++ is used only to change association of page, so any error ++ may no longer be valid. */ ++ *pm_entry = SET_PM_ERROR (SET_PM_NEXTERROR (*pm_entry, 0), 0); ++ } ++ + ports_port_deref (p); + return 0; + +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/libpager/pager-create.c hurd/libpager/pager-create.c +--- ../cvs/hurd/libpager/pager-create.c 1996-05-09 19:47:42.000000000 +0300 ++++ hurd/libpager/pager-create.c 2004-09-28 11:44:24.000000000 +0300 +@@ -1,5 +1,5 @@ + /* Pager creation +- Copyright (C) 1994, 1995, 1996 Free Software Foundation ++ Copyright (C) 1994, 1995, 1996, 2004 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as +@@ -22,7 +22,8 @@ struct pager * + pager_create (struct user_pager_info *upi, + struct port_bucket *bucket, + boolean_t may_cache, +- memory_object_copy_strategy_t copy_strategy) ++ memory_object_copy_strategy_t copy_strategy, ++ boolean_t notify_on_evict) + { + struct pager *p; + +@@ -38,6 +39,7 @@ pager_create (struct user_pager_info *up + p->attribute_requests = 0; + p->may_cache = may_cache; + p->copy_strategy = copy_strategy; ++ p->notify_on_evict = notify_on_evict; + p->memobjcntl = MACH_PORT_NULL; + p->memobjname = MACH_PORT_NULL; + p->seqno = -1; +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/libpager/pager.h hurd/libpager/pager.h +--- ../cvs/hurd/libpager/pager.h 1999-07-04 02:51:02.000000000 +0300 ++++ hurd/libpager/pager.h 2004-09-28 11:41:29.000000000 +0300 +@@ -1,5 +1,5 @@ + /* Definitions for multi-threaded pager library +- Copyright (C) 1994, 1995, 1996, 1997, 1999 Free Software Foundation, Inc. ++ Copyright (C) 1994,1995,1996,1997,1999,2004 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as +@@ -32,18 +32,21 @@ int pager_demuxer (mach_msg_header_t *in + mach_msg_header_t *outp); + + /* Create a new pager. The pager will have a port created for it +- (using libports, in BUCKET) and will be immediately ready +- to receive requests. U_PAGER will be provided to later calls to ++ (using libports, in BUCKET) and will be immediately ready to ++ receive requests. U_PAGER will be provided to later calls to + pager_find_address. The pager will have one user reference + created. MAY_CACHE and COPY_STRATEGY are the original values of +- those attributes as for memory_object_ready. Users may create +- references to pagers by use of the relevant ports library +- functions. On errors, return null and set errno. */ ++ those attributes as for memory_object_ready. If NOTIFY_ON_EVICT is ++ non-zero, pager_notify_evict user callback will be called when page ++ is evicted. Users may create references to pagers by use of the ++ relevant ports library functions. On errors, return null and set ++ errno. */ + struct pager * + pager_create (struct user_pager_info *u_pager, + struct port_bucket *bucket, + boolean_t may_cache, +- memory_object_copy_strategy_t copy_strategy); ++ memory_object_copy_strategy_t copy_strategy, ++ boolean_t notify_on_evict); + + /* Return the user_pager_info struct associated with a pager. */ + struct user_pager_info * +@@ -110,7 +113,7 @@ pager_offer_page (struct pager *pager, + /* Change the attributes of the memory object underlying pager PAGER. + Args MAY_CACHE and COPY_STRATEGY are as for + memory_object_change_atributes. Wait for the kernel to report completion +- off WAIT is set.*/ ++ iff WAIT is set. */ + void + pager_change_attributes (struct pager *pager, + boolean_t may_cache, +@@ -172,6 +175,15 @@ error_t + pager_unlock_page (struct user_pager_info *pager, + vm_offset_t address); + ++/* The user must define this function. It is used when you want be ++able to change association of pages to backing store. To use it, pass ++non-zero value in NOTIFY_ON_EVICT when pager is created. You can ++change association of page only when pager_notify_evict has been ++called and you haven't touched page content after that. */ ++void ++pager_notify_evict (struct user_pager_info *pager, ++ vm_offset_t page); ++ + /* The user must define this function. It should report back (in + *OFFSET and *SIZE the minimum valid address the pager will accept + and the size of the object. */ +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/libpager/priv.h hurd/libpager/priv.h +--- ../cvs/hurd/libpager/priv.h 2000-07-25 22:40:27.000000000 +0300 ++++ hurd/libpager/priv.h 2004-09-25 17:37:39.000000000 +0300 +@@ -1,5 +1,5 @@ + /* Private data for pager library. +- Copyright (C) 1994,95,96,97,99, 2000 Free Software Foundation, Inc. ++ Copyright (C) 1994,95,96,97,99,2000,04 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as +@@ -45,6 +45,7 @@ struct pager + + boolean_t may_cache; + memory_object_copy_strategy_t copy_strategy; ++ boolean_t notify_on_evict; + + /* Interface ports */ + memory_object_control_t memobjcntl; +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/storeio/pager.c hurd/storeio/pager.c +--- ../cvs/hurd/storeio/pager.c 2002-05-08 13:17:41.000000000 +0300 ++++ hurd/storeio/pager.c 2004-09-29 17:49:28.000000000 +0300 +@@ -1,6 +1,6 @@ + /* Paging interface for storeio devices + +- Copyright (C) 1995,96,97,99,2002 Free Software Foundation, Inc. ++ Copyright (C) 1995,96,97,99,2002,04 Free Software Foundation, Inc. + + Written by Miles Bader <miles@gnu.ai.mit.edu> + +@@ -109,6 +109,13 @@ pager_unlock_page (struct user_pager_inf + return 0; + } + ++void ++pager_notify_evict (struct user_pager_info *pager, ++ vm_offset_t page) ++{ ++ assert (!"unrequested notification on eviction"); ++} ++ + /* The user must define this function. It should report back (in + *OFFSET and *SIZE the minimum valid address the pager will accept + and the size of the object. */ +@@ -232,7 +239,7 @@ dev_get_memory_object (struct dev *dev, + { + dev->pager = + pager_create ((struct user_pager_info *)dev, pager_port_bucket, +- 1, MEMORY_OBJECT_COPY_DELAY); ++ 1, MEMORY_OBJECT_COPY_DELAY, 0); + if (dev->pager == NULL) + { + mutex_unlock (&dev->pager_lock); +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/tmpfs/pager-stubs.c hurd/tmpfs/pager-stubs.c +--- ../cvs/hurd/tmpfs/pager-stubs.c 2001-02-26 06:13:58.000000000 +0200 ++++ hurd/tmpfs/pager-stubs.c 2004-09-29 17:49:28.000000000 +0300 +@@ -1,5 +1,5 @@ + /* stupid stub functions never called, needed because libdiskfs uses libpager +- Copyright (C) 2001 Free Software Foundation, Inc. ++ Copyright (C) 2001, 2004 Free Software Foundation, Inc. + + This file is part of the GNU Hurd. + +@@ -57,6 +57,14 @@ pager_unlock_page (struct user_pager_inf + return EIEIO; + } + ++void ++pager_notify_evict (struct user_pager_info *pager, ++ vm_offset_t page) ++{ ++ abort(); ++} ++ ++ + /* The user must define this function. It should report back (in + *OFFSET and *SIZE the minimum valid address the pager will accept + and the size of the object. */ +diff -urpN --exclude='*~' --exclude=ChangeLog --exclude=build ../cvs/hurd/ufs/pager.c hurd/ufs/pager.c +--- ../cvs/hurd/ufs/pager.c 1999-09-13 09:35:07.000000000 +0300 ++++ hurd/ufs/pager.c 2004-09-29 17:49:28.000000000 +0300 +@@ -1,5 +1,5 @@ + /* Pager for ufs +- Copyright (C) 1994, 1995, 1996, 1997, 1999 Free Software Foundation ++ Copyright (C) 1994,1995,1996,1997,1999,2004 Free Software Foundation Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as +@@ -425,6 +425,13 @@ pager_unlock_page (struct user_pager_inf + return err; + } + ++void ++pager_notify_evict (struct user_pager_info *pager, ++ vm_offset_t page) ++{ ++ assert (!"unrequested notification on eviction"); ++} ++ + /* Implement the pager_report_extent callback from the pager library. See + <hurd/pager.h> for the interface description. */ + inline error_t +@@ -477,7 +484,7 @@ create_disk_pager (void) + upi->type = DISK; + upi->np = 0; + pager_bucket = ports_create_bucket (); +- diskfs_start_disk_pager (upi, pager_bucket, MAY_CACHE, store->size, ++ diskfs_start_disk_pager (upi, pager_bucket, MAY_CACHE, 0, store->size, + &disk_image); + upi->p = diskfs_disk_pager; + } +@@ -570,7 +577,7 @@ diskfs_get_filemap (struct node *np, vm_ + upi->unlocked_pagein_length = 0; + diskfs_nref_light (np); + upi->p = pager_create (upi, pager_bucket, +- MAY_CACHE, MEMORY_OBJECT_COPY_DELAY); ++ MAY_CACHE, MEMORY_OBJECT_COPY_DELAY, 0); + if (upi->p == 0) + { + diskfs_nrele_light (np); |