aboutsummaryrefslogtreecommitdiff
path: root/fs/jffs2/build.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/jffs2/build.c')
-rw-r--r--fs/jffs2/build.c217
1 files changed, 122 insertions, 95 deletions
diff --git a/fs/jffs2/build.c b/fs/jffs2/build.c
index 97dc39796e2..a3750f902ad 100644
--- a/fs/jffs2/build.c
+++ b/fs/jffs2/build.c
@@ -1,16 +1,17 @@
/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
- * Copyright (C) 2001-2003 Red Hat, Inc.
+ * Copyright © 2001-2007 Red Hat, Inc.
+ * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
*
* Created by David Woodhouse <dwmw2@infradead.org>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
- * $Id: build.c,v 1.71 2005/07/12 16:37:08 dedekind Exp $
- *
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
@@ -18,12 +19,13 @@
#include <linux/mtd/mtd.h>
#include "nodelist.h"
-static void jffs2_build_remove_unlinked_inode(struct jffs2_sb_info *, struct jffs2_inode_cache *, struct jffs2_full_dirent **);
+static void jffs2_build_remove_unlinked_inode(struct jffs2_sb_info *,
+ struct jffs2_inode_cache *, struct jffs2_full_dirent **);
static inline struct jffs2_inode_cache *
first_inode_chain(int *i, struct jffs2_sb_info *c)
{
- for (; *i < INOCACHE_HASHSIZE; (*i)++) {
+ for (; *i < c->inocache_hashsize; (*i)++) {
if (c->inocache_list[*i])
return c->inocache_list[*i];
}
@@ -46,11 +48,12 @@ next_inode(int *i, struct jffs2_inode_cache *ic, struct jffs2_sb_info *c)
ic = next_inode(&i, ic, (c)))
-static inline void jffs2_build_inode_pass1(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
+static void jffs2_build_inode_pass1(struct jffs2_sb_info *c,
+ struct jffs2_inode_cache *ic)
{
struct jffs2_full_dirent *fd;
- D1(printk(KERN_DEBUG "jffs2_build_inode building directory inode #%u\n", ic->ino));
+ dbg_fsbuild("building directory inode #%u\n", ic->ino);
/* For each child, increase nlink */
for(fd = ic->scan_dents; fd; fd = fd->next) {
@@ -58,26 +61,29 @@ static inline void jffs2_build_inode_pass1(struct jffs2_sb_info *c, struct jffs2
if (!fd->ino)
continue;
- /* XXX: Can get high latency here with huge directories */
+ /* we can get high latency here with huge directories */
child_ic = jffs2_get_ino_cache(c, fd->ino);
if (!child_ic) {
- printk(KERN_NOTICE "Eep. Child \"%s\" (ino #%u) of dir ino #%u doesn't exist!\n",
+ dbg_fsbuild("child \"%s\" (ino #%u) of dir ino #%u doesn't exist!\n",
fd->name, fd->ino, ic->ino);
jffs2_mark_node_obsolete(c, fd->raw);
continue;
}
- if (child_ic->nlink++ && fd->type == DT_DIR) {
- printk(KERN_NOTICE "Child dir \"%s\" (ino #%u) of dir ino #%u appears to be a hard link\n", fd->name, fd->ino, ic->ino);
- if (fd->ino == 1 && ic->ino == 1) {
- printk(KERN_NOTICE "This is mostly harmless, and probably caused by creating a JFFS2 image\n");
- printk(KERN_NOTICE "using a buggy version of mkfs.jffs2. Use at least v1.17.\n");
+ if (fd->type == DT_DIR) {
+ if (child_ic->pino_nlink) {
+ JFFS2_ERROR("child dir \"%s\" (ino #%u) of dir ino #%u appears to be a hard link\n",
+ fd->name, fd->ino, ic->ino);
+ /* TODO: What do we do about it? */
+ } else {
+ child_ic->pino_nlink = ic->ino;
}
- /* What do we do about it? */
- }
- D1(printk(KERN_DEBUG "Increased nlink for child \"%s\" (ino #%u)\n", fd->name, fd->ino));
- /* Can't free them. We might need them in pass 2 */
+ } else
+ child_ic->pino_nlink++;
+
+ dbg_fsbuild("increased nlink for child \"%s\" (ino #%u)\n", fd->name, fd->ino);
+ /* Can't free scan_dents so far. We might need them in pass 2 */
}
}
@@ -94,6 +100,8 @@ static int jffs2_build_filesystem(struct jffs2_sb_info *c)
struct jffs2_full_dirent *fd;
struct jffs2_full_dirent *dead_fds = NULL;
+ dbg_fsbuild("build FS data structures\n");
+
/* First, scan the medium and build all the inode caches with
lists of physical nodes */
@@ -103,60 +111,54 @@ static int jffs2_build_filesystem(struct jffs2_sb_info *c)
if (ret)
goto exit;
- D1(printk(KERN_DEBUG "Scanned flash completely\n"));
- D2(jffs2_dump_block_lists(c));
+ dbg_fsbuild("scanned flash completely\n");
+ jffs2_dbg_dump_block_lists_nolock(c);
+ dbg_fsbuild("pass 1 starting\n");
c->flags |= JFFS2_SB_FLAG_BUILDING;
/* Now scan the directory tree, increasing nlink according to every dirent found. */
for_each_inode(i, c, ic) {
- D1(printk(KERN_DEBUG "Pass 1: ino #%u\n", ic->ino));
-
- D1(BUG_ON(ic->ino > c->highest_ino));
-
if (ic->scan_dents) {
jffs2_build_inode_pass1(c, ic);
cond_resched();
}
}
- D1(printk(KERN_DEBUG "Pass 1 complete\n"));
+ dbg_fsbuild("pass 1 complete\n");
/* Next, scan for inodes with nlink == 0 and remove them. If
they were directories, then decrement the nlink of their
children too, and repeat the scan. As that's going to be
a fairly uncommon occurrence, it's not so evil to do it this
way. Recursion bad. */
- D1(printk(KERN_DEBUG "Pass 2 starting\n"));
+ dbg_fsbuild("pass 2 starting\n");
for_each_inode(i, c, ic) {
- D1(printk(KERN_DEBUG "Pass 2: ino #%u, nlink %d, ic %p, nodes %p\n", ic->ino, ic->nlink, ic, ic->nodes));
- if (ic->nlink)
+ if (ic->pino_nlink)
continue;
-
+
jffs2_build_remove_unlinked_inode(c, ic, &dead_fds);
cond_resched();
- }
+ }
- D1(printk(KERN_DEBUG "Pass 2a starting\n"));
+ dbg_fsbuild("pass 2a starting\n");
while (dead_fds) {
fd = dead_fds;
dead_fds = fd->next;
ic = jffs2_get_ino_cache(c, fd->ino);
- D1(printk(KERN_DEBUG "Removing dead_fd ino #%u (\"%s\"), ic at %p\n", fd->ino, fd->name, ic));
if (ic)
jffs2_build_remove_unlinked_inode(c, ic, &dead_fds);
jffs2_free_full_dirent(fd);
}
- D1(printk(KERN_DEBUG "Pass 2 complete\n"));
-
+ dbg_fsbuild("pass 2a complete\n");
+ dbg_fsbuild("freeing temporary data structures\n");
+
/* Finally, we can scan again and free the dirent structs */
for_each_inode(i, c, ic) {
- D1(printk(KERN_DEBUG "Pass 3: ino #%u, ic %p, nodes %p\n", ic->ino, ic, ic->nodes));
-
while(ic->scan_dents) {
fd = ic->scan_dents;
ic->scan_dents = fd->next;
@@ -165,10 +167,10 @@ static int jffs2_build_filesystem(struct jffs2_sb_info *c)
ic->scan_dents = NULL;
cond_resched();
}
+ jffs2_build_xattr_subsystem(c);
c->flags &= ~JFFS2_SB_FLAG_BUILDING;
-
- D1(printk(KERN_DEBUG "Pass 3 complete\n"));
- D2(jffs2_dump_block_lists(c));
+
+ dbg_fsbuild("FS build complete\n");
/* Rotate the lists by some number to ensure wear levelling */
jffs2_rotate_lists(c);
@@ -184,29 +186,32 @@ exit:
jffs2_free_full_dirent(fd);
}
}
+ jffs2_clear_xattr_subsystem(c);
}
return ret;
}
-static void jffs2_build_remove_unlinked_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, struct jffs2_full_dirent **dead_fds)
+static void jffs2_build_remove_unlinked_inode(struct jffs2_sb_info *c,
+ struct jffs2_inode_cache *ic,
+ struct jffs2_full_dirent **dead_fds)
{
struct jffs2_raw_node_ref *raw;
struct jffs2_full_dirent *fd;
- D1(printk(KERN_DEBUG "JFFS2: Removing ino #%u with nlink == zero.\n", ic->ino));
-
+ dbg_fsbuild("removing ino #%u with nlink == zero.\n", ic->ino);
+
raw = ic->nodes;
while (raw != (void *)ic) {
struct jffs2_raw_node_ref *next = raw->next_in_ino;
- D1(printk(KERN_DEBUG "obsoleting node at 0x%08x\n", ref_offset(raw)));
+ dbg_fsbuild("obsoleting node at 0x%08x\n", ref_offset(raw));
jffs2_mark_node_obsolete(c, raw);
raw = next;
}
if (ic->scan_dents) {
int whinged = 0;
- D1(printk(KERN_DEBUG "Inode #%u was a directory which may have children...\n", ic->ino));
+ dbg_fsbuild("inode #%u was a directory which may have children...\n", ic->ino);
while(ic->scan_dents) {
struct jffs2_inode_cache *child_ic;
@@ -216,45 +221,46 @@ static void jffs2_build_remove_unlinked_inode(struct jffs2_sb_info *c, struct jf
if (!fd->ino) {
/* It's a deletion dirent. Ignore it */
- D1(printk(KERN_DEBUG "Child \"%s\" is a deletion dirent, skipping...\n", fd->name));
+ dbg_fsbuild("child \"%s\" is a deletion dirent, skipping...\n", fd->name);
jffs2_free_full_dirent(fd);
continue;
}
- if (!whinged) {
+ if (!whinged)
whinged = 1;
- printk(KERN_NOTICE "Inode #%u was a directory with children - removing those too...\n", ic->ino);
- }
- D1(printk(KERN_DEBUG "Removing child \"%s\", ino #%u\n",
- fd->name, fd->ino));
-
+ dbg_fsbuild("removing child \"%s\", ino #%u\n", fd->name, fd->ino);
+
child_ic = jffs2_get_ino_cache(c, fd->ino);
if (!child_ic) {
- printk(KERN_NOTICE "Cannot remove child \"%s\", ino #%u, because it doesn't exist\n", fd->name, fd->ino);
+ dbg_fsbuild("cannot remove child \"%s\", ino #%u, because it doesn't exist\n",
+ fd->name, fd->ino);
jffs2_free_full_dirent(fd);
continue;
}
- /* Reduce nlink of the child. If it's now zero, stick it on the
+ /* Reduce nlink of the child. If it's now zero, stick it on the
dead_fds list to be cleaned up later. Else just free the fd */
- child_ic->nlink--;
-
- if (!child_ic->nlink) {
- D1(printk(KERN_DEBUG "Inode #%u (\"%s\") has now got zero nlink. Adding to dead_fds list.\n",
- fd->ino, fd->name));
+ if (fd->type == DT_DIR)
+ child_ic->pino_nlink = 0;
+ else
+ child_ic->pino_nlink--;
+
+ if (!child_ic->pino_nlink) {
+ dbg_fsbuild("inode #%u (\"%s\") now has no links; adding to dead_fds list.\n",
+ fd->ino, fd->name);
fd->next = *dead_fds;
*dead_fds = fd;
} else {
- D1(printk(KERN_DEBUG "Inode #%u (\"%s\") has now got nlink %d. Ignoring.\n",
- fd->ino, fd->name, child_ic->nlink));
+ dbg_fsbuild("inode #%u (\"%s\") has now got nlink %d. Ignoring.\n",
+ fd->ino, fd->name, child_ic->pino_nlink);
jffs2_free_full_dirent(fd);
}
}
}
/*
- We don't delete the inocache from the hash list and free it yet.
+ We don't delete the inocache from the hash list and free it yet.
The erase code will do that, when all the nodes are completely gone.
*/
}
@@ -268,7 +274,7 @@ static void jffs2_calc_trigger_levels(struct jffs2_sb_info *c)
because there's not enough free space... */
c->resv_blocks_deletion = 2;
- /* Be conservative about how much space we need before we allow writes.
+ /* Be conservative about how much space we need before we allow writes.
On top of that which is required for deletia, require an extra 2%
of the medium to be available, for overhead caused by nodes being
split across blocks, etc. */
@@ -283,7 +289,7 @@ static void jffs2_calc_trigger_levels(struct jffs2_sb_info *c)
c->resv_blocks_gctrigger = c->resv_blocks_write + 1;
- /* When do we allow garbage collection to merge nodes to make
+ /* When do we allow garbage collection to merge nodes to make
long-term progress at the expense of short-term space exhaustion? */
c->resv_blocks_gcmerge = c->resv_blocks_deletion + 1;
@@ -291,49 +297,58 @@ static void jffs2_calc_trigger_levels(struct jffs2_sb_info *c)
than actually making progress? */
c->resv_blocks_gcbad = 0;//c->resv_blocks_deletion + 2;
+ /* What number of 'very dirty' eraseblocks do we allow before we
+ trigger the GC thread even if we don't _need_ the space. When we
+ can't mark nodes obsolete on the medium, the old dirty nodes cause
+ performance problems because we have to inspect and discard them. */
+ c->vdirty_blocks_gctrigger = c->resv_blocks_gctrigger;
+ if (jffs2_can_mark_obsolete(c))
+ c->vdirty_blocks_gctrigger *= 10;
+
/* If there's less than this amount of dirty space, don't bother
trying to GC to make more space. It'll be a fruitless task */
c->nospc_dirty_size = c->sector_size + (c->flash_size / 100);
- D1(printk(KERN_DEBUG "JFFS2 trigger levels (size %d KiB, block size %d KiB, %d blocks)\n",
- c->flash_size / 1024, c->sector_size / 1024, c->nr_blocks));
- D1(printk(KERN_DEBUG "Blocks required to allow deletion: %d (%d KiB)\n",
- c->resv_blocks_deletion, c->resv_blocks_deletion*c->sector_size/1024));
- D1(printk(KERN_DEBUG "Blocks required to allow writes: %d (%d KiB)\n",
- c->resv_blocks_write, c->resv_blocks_write*c->sector_size/1024));
- D1(printk(KERN_DEBUG "Blocks required to quiesce GC thread: %d (%d KiB)\n",
- c->resv_blocks_gctrigger, c->resv_blocks_gctrigger*c->sector_size/1024));
- D1(printk(KERN_DEBUG "Blocks required to allow GC merges: %d (%d KiB)\n",
- c->resv_blocks_gcmerge, c->resv_blocks_gcmerge*c->sector_size/1024));
- D1(printk(KERN_DEBUG "Blocks required to GC bad blocks: %d (%d KiB)\n",
- c->resv_blocks_gcbad, c->resv_blocks_gcbad*c->sector_size/1024));
- D1(printk(KERN_DEBUG "Amount of dirty space required to GC: %d bytes\n",
- c->nospc_dirty_size));
-}
+ dbg_fsbuild("trigger levels (size %d KiB, block size %d KiB, %d blocks)\n",
+ c->flash_size / 1024, c->sector_size / 1024, c->nr_blocks);
+ dbg_fsbuild("Blocks required to allow deletion: %d (%d KiB)\n",
+ c->resv_blocks_deletion, c->resv_blocks_deletion*c->sector_size/1024);
+ dbg_fsbuild("Blocks required to allow writes: %d (%d KiB)\n",
+ c->resv_blocks_write, c->resv_blocks_write*c->sector_size/1024);
+ dbg_fsbuild("Blocks required to quiesce GC thread: %d (%d KiB)\n",
+ c->resv_blocks_gctrigger, c->resv_blocks_gctrigger*c->sector_size/1024);
+ dbg_fsbuild("Blocks required to allow GC merges: %d (%d KiB)\n",
+ c->resv_blocks_gcmerge, c->resv_blocks_gcmerge*c->sector_size/1024);
+ dbg_fsbuild("Blocks required to GC bad blocks: %d (%d KiB)\n",
+ c->resv_blocks_gcbad, c->resv_blocks_gcbad*c->sector_size/1024);
+ dbg_fsbuild("Amount of dirty space required to GC: %d bytes\n",
+ c->nospc_dirty_size);
+ dbg_fsbuild("Very dirty blocks before GC triggered: %d\n",
+ c->vdirty_blocks_gctrigger);
+}
int jffs2_do_mount_fs(struct jffs2_sb_info *c)
{
+ int ret;
int i;
+ int size;
c->free_size = c->flash_size;
c->nr_blocks = c->flash_size / c->sector_size;
- if (c->mtd->flags & MTD_NO_VIRTBLOCKS)
- c->blocks = vmalloc(sizeof(struct jffs2_eraseblock) * c->nr_blocks);
+ size = sizeof(struct jffs2_eraseblock) * c->nr_blocks;
+#ifndef __ECOS
+ if (jffs2_blocks_use_vmalloc(c))
+ c->blocks = vzalloc(size);
else
- c->blocks = kmalloc(sizeof(struct jffs2_eraseblock) * c->nr_blocks, GFP_KERNEL);
+#endif
+ c->blocks = kzalloc(size, GFP_KERNEL);
if (!c->blocks)
return -ENOMEM;
+
for (i=0; i<c->nr_blocks; i++) {
INIT_LIST_HEAD(&c->blocks[i].list);
c->blocks[i].offset = i * c->sector_size;
c->blocks[i].free_size = c->sector_size;
- c->blocks[i].dirty_size = 0;
- c->blocks[i].wasted_size = 0;
- c->blocks[i].unchecked_size = 0;
- c->blocks[i].used_size = 0;
- c->blocks[i].first_node = NULL;
- c->blocks[i].last_node = NULL;
- c->blocks[i].bad_count = 0;
}
INIT_LIST_HEAD(&c->clean_list);
@@ -341,6 +356,7 @@ int jffs2_do_mount_fs(struct jffs2_sb_info *c)
INIT_LIST_HEAD(&c->dirty_list);
INIT_LIST_HEAD(&c->erasable_list);
INIT_LIST_HEAD(&c->erasing_list);
+ INIT_LIST_HEAD(&c->erase_checking_list);
INIT_LIST_HEAD(&c->erase_pending_list);
INIT_LIST_HEAD(&c->erasable_pending_wbuf_list);
INIT_LIST_HEAD(&c->erase_complete_list);
@@ -348,20 +364,31 @@ int jffs2_do_mount_fs(struct jffs2_sb_info *c)
INIT_LIST_HEAD(&c->bad_list);
INIT_LIST_HEAD(&c->bad_used_list);
c->highest_ino = 1;
+ c->summary = NULL;
+
+ ret = jffs2_sum_init(c);
+ if (ret)
+ goto out_free;
if (jffs2_build_filesystem(c)) {
- D1(printk(KERN_DEBUG "build_fs failed\n"));
+ dbg_fsbuild("build_fs failed\n");
jffs2_free_ino_caches(c);
jffs2_free_raw_node_refs(c);
- if (c->mtd->flags & MTD_NO_VIRTBLOCKS) {
- vfree(c->blocks);
- } else {
- kfree(c->blocks);
- }
- return -EIO;
+ ret = -EIO;
+ goto out_free;
}
jffs2_calc_trigger_levels(c);
return 0;
+
+ out_free:
+#ifndef __ECOS
+ if (jffs2_blocks_use_vmalloc(c))
+ vfree(c->blocks);
+ else
+#endif
+ kfree(c->blocks);
+
+ return ret;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-06 02:26:04 +0000