summaryrefslogtreecommitdiff
path: root/fs/ubifs
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2011-03-18 20:50:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-18 20:50:27 +0300
commit8f627a8a881481598c2591c3acc122fb9be7bac4 (patch)
tree06497d25e30824500aeaf8c736c45b070f121234 /fs/ubifs
parentfd57ed021990157ee5b3997c3f21c734093a9e23 (diff)
parent5d630e43284fdb0613e4e7e7dd906f27bc25b6af (diff)
downloadlinux-8f627a8a881481598c2591c3acc122fb9be7bac4.tar.xz
Merge branch 'linux-next' of git://git.infradead.org/ubifs-2.6
* 'linux-next' of git://git.infradead.org/ubifs-2.6: (25 commits) UBIFS: clean-up commentaries UBIFS: save 128KiB or more RAM UBIFS: allocate orphans scan buffer on demand UBIFS: allocate lpt dump buffer on demand UBIFS: allocate ltab checking buffer on demand UBIFS: allocate scanning buffer on demand UBIFS: allocate dump buffer on demand UBIFS: do not check data crc by default UBIFS: simplify UBIFS Kconfig menu UBIFS: print max. index node size UBIFS: handle allocation failures in UBIFS write path UBIFS: use max_write_size during recovery UBIFS: use max_write_size for write-buffers UBIFS: introduce write-buffer size field UBI: incorporate LEB offset information UBIFS: incorporate maximum write size UBI: provide LEB offset information UBI: incorporate maximum write size UBIFS: fix LEB number in printk UBIFS: restrict world-writable debugfs files ...
Diffstat (limited to 'fs/ubifs')
-rw-r--r--fs/ubifs/Kconfig23
-rw-r--r--fs/ubifs/commit.c58
-rw-r--r--fs/ubifs/debug.c34
-rw-r--r--fs/ubifs/debug.h30
-rw-r--r--fs/ubifs/io.c201
-rw-r--r--fs/ubifs/journal.c28
-rw-r--r--fs/ubifs/lprops.c26
-rw-r--r--fs/ubifs/lpt_commit.c56
-rw-r--r--fs/ubifs/orphan.c10
-rw-r--r--fs/ubifs/recovery.c44
-rw-r--r--fs/ubifs/scan.c2
-rw-r--r--fs/ubifs/super.c54
-rw-r--r--fs/ubifs/tnc.c10
-rw-r--r--fs/ubifs/ubifs.h45
14 files changed, 447 insertions, 174 deletions
diff --git a/fs/ubifs/Kconfig b/fs/ubifs/Kconfig
index 830e3f76f442..1d1859dc3de5 100644
--- a/fs/ubifs/Kconfig
+++ b/fs/ubifs/Kconfig
@@ -44,23 +44,20 @@ config UBIFS_FS_ZLIB
# Debugging-related stuff
config UBIFS_FS_DEBUG
- bool "Enable debugging"
+ bool "Enable debugging support"
depends on UBIFS_FS
select DEBUG_FS
select KALLSYMS_ALL
help
- This option enables UBIFS debugging.
-
-config UBIFS_FS_DEBUG_MSG_LVL
- int "Default message level (0 = no extra messages, 3 = lots)"
- depends on UBIFS_FS_DEBUG
- default "0"
- help
- This controls the amount of debugging messages produced by UBIFS.
- If reporting bugs, please try to have available a full dump of the
- messages at level 1 while the misbehaviour was occurring. Level 2
- may become necessary if level 1 messages were not enough to find the
- bug. Generally Level 3 should be avoided.
+ This option enables UBIFS debugging support. It makes sure various
+ assertions, self-checks, debugging messages and test modes are compiled
+ in (this all is compiled out otherwise). Assertions are light-weight
+ and this option also enables them. Self-checks, debugging messages and
+ test modes are switched off by default. Thus, it is safe and actually
+ recommended to have debugging support enabled, and it should not slow
+ down UBIFS. You can then further enable / disable individual debugging
+ features using UBIFS module parameters and the corresponding sysfs
+ interfaces.
config UBIFS_FS_DEBUG_CHKS
bool "Enable extra checks"
diff --git a/fs/ubifs/commit.c b/fs/ubifs/commit.c
index 02429d81ca33..b148fbc80f8d 100644
--- a/fs/ubifs/commit.c
+++ b/fs/ubifs/commit.c
@@ -48,6 +48,56 @@
#include <linux/slab.h>
#include "ubifs.h"
+/*
+ * nothing_to_commit - check if there is nothing to commit.
+ * @c: UBIFS file-system description object
+ *
+ * This is a helper function which checks if there is anything to commit. It is
+ * used as an optimization to avoid starting the commit if it is not really
+ * necessary. Indeed, the commit operation always assumes flash I/O (e.g.,
+ * writing the commit start node to the log), and it is better to avoid doing
+ * this unnecessarily. E.g., 'ubifs_sync_fs()' runs the commit, but if there is
+ * nothing to commit, it is more optimal to avoid any flash I/O.
+ *
+ * This function has to be called with @c->commit_sem locked for writing -
+ * this function does not take LPT/TNC locks because the @c->commit_sem
+ * guarantees that we have exclusive access to the TNC and LPT data structures.
+ *
+ * This function returns %1 if there is nothing to commit and %0 otherwise.
+ */
+static int nothing_to_commit(struct ubifs_info *c)
+{
+ /*
+ * During mounting or remounting from R/O mode to R/W mode we may
+ * commit for various recovery-related reasons.
+ */
+ if (c->mounting || c->remounting_rw)
+ return 0;
+
+ /*
+ * If the root TNC node is dirty, we definitely have something to
+ * commit.
+ */
+ if (c->zroot.znode && test_bit(DIRTY_ZNODE, &c->zroot.znode->flags))
+ return 0;
+
+ /*
+ * Even though the TNC is clean, the LPT tree may have dirty nodes. For
+ * example, this may happen if the budgeting subsystem invoked GC to
+ * make some free space, and the GC found an LEB with only dirty and
+ * free space. In this case GC would just change the lprops of this
+ * LEB (by turning all space into free space) and unmap it.
+ */
+ if (c->nroot && test_bit(DIRTY_CNODE, &c->nroot->flags))
+ return 0;
+
+ ubifs_assert(atomic_long_read(&c->dirty_zn_cnt) == 0);
+ ubifs_assert(c->dirty_pn_cnt == 0);
+ ubifs_assert(c->dirty_nn_cnt == 0);
+
+ return 1;
+}
+
/**
* do_commit - commit the journal.
* @c: UBIFS file-system description object
@@ -70,6 +120,12 @@ static int do_commit(struct ubifs_info *c)
goto out_up;
}
+ if (nothing_to_commit(c)) {
+ up_write(&c->commit_sem);
+ err = 0;
+ goto out_cancel;
+ }
+
/* Sync all write buffers (necessary for recovery) */
for (i = 0; i < c->jhead_cnt; i++) {
err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
@@ -162,12 +218,12 @@ static int do_commit(struct ubifs_info *c)
if (err)
goto out;
+out_cancel:
spin_lock(&c->cs_lock);
c->cmt_state = COMMIT_RESTING;
wake_up(&c->cmt_wq);
dbg_cmt("commit end");
spin_unlock(&c->cs_lock);
-
return 0;
out_up:
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 0bee4dbffc31..01c2b028e525 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -43,8 +43,8 @@ DEFINE_SPINLOCK(dbg_lock);
static char dbg_key_buf0[128];
static char dbg_key_buf1[128];
-unsigned int ubifs_msg_flags = UBIFS_MSG_FLAGS_DEFAULT;
-unsigned int ubifs_chk_flags = UBIFS_CHK_FLAGS_DEFAULT;
+unsigned int ubifs_msg_flags;
+unsigned int ubifs_chk_flags;
unsigned int ubifs_tst_flags;
module_param_named(debug_msgs, ubifs_msg_flags, uint, S_IRUGO | S_IWUSR);
@@ -810,16 +810,24 @@ void dbg_dump_leb(const struct ubifs_info *c, int lnum)
{
struct ubifs_scan_leb *sleb;
struct ubifs_scan_node *snod;
+ void *buf;
if (dbg_failure_mode)
return;
printk(KERN_DEBUG "(pid %d) start dumping LEB %d\n",
current->pid, lnum);
- sleb = ubifs_scan(c, lnum, 0, c->dbg->buf, 0);
+
+ buf = __vmalloc(c->leb_size, GFP_KERNEL | GFP_NOFS, PAGE_KERNEL);
+ if (!buf) {
+ ubifs_err("cannot allocate memory for dumping LEB %d", lnum);
+ return;
+ }
+
+ sleb = ubifs_scan(c, lnum, 0, buf, 0);
if (IS_ERR(sleb)) {
ubifs_err("scan error %d", (int)PTR_ERR(sleb));
- return;
+ goto out;
}
printk(KERN_DEBUG "LEB %d has %d nodes ending at %d\n", lnum,
@@ -835,6 +843,9 @@ void dbg_dump_leb(const struct ubifs_info *c, int lnum)
printk(KERN_DEBUG "(pid %d) finish dumping LEB %d\n",
current->pid, lnum);
ubifs_scan_destroy(sleb);
+
+out:
+ vfree(buf);
return;
}
@@ -2690,16 +2701,8 @@ int ubifs_debugging_init(struct ubifs_info *c)
if (!c->dbg)
return -ENOMEM;
- c->dbg->buf = vmalloc(c->leb_size);
- if (!c->dbg->buf)
- goto out;
-
failure_mode_init(c);
return 0;
-
-out:
- kfree(c->dbg);
- return -ENOMEM;
}
/**
@@ -2709,7 +2712,6 @@ out:
void ubifs_debugging_exit(struct ubifs_info *c)
{
failure_mode_exit(c);
- vfree(c->dbg->buf);
kfree(c->dbg);
}
@@ -2813,19 +2815,19 @@ int dbg_debugfs_init_fs(struct ubifs_info *c)
}
fname = "dump_lprops";
- dent = debugfs_create_file(fname, S_IWUGO, d->dfs_dir, c, &dfs_fops);
+ dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
if (IS_ERR(dent))
goto out_remove;
d->dfs_dump_lprops = dent;
fname = "dump_budg";
- dent = debugfs_create_file(fname, S_IWUGO, d->dfs_dir, c, &dfs_fops);
+ dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
if (IS_ERR(dent))
goto out_remove;
d->dfs_dump_budg = dent;
fname = "dump_tnc";
- dent = debugfs_create_file(fname, S_IWUGO, d->dfs_dir, c, &dfs_fops);
+ dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, c, &dfs_fops);
if (IS_ERR(dent))
goto out_remove;
d->dfs_dump_tnc = dent;
diff --git a/fs/ubifs/debug.h b/fs/ubifs/debug.h
index 69ebe4729151..919f0de29d8f 100644
--- a/fs/ubifs/debug.h
+++ b/fs/ubifs/debug.h
@@ -27,7 +27,6 @@
/**
* ubifs_debug_info - per-FS debugging information.
- * @buf: a buffer of LEB size, used for various purposes
* @old_zroot: old index root - used by 'dbg_check_old_index()'
* @old_zroot_level: old index root level - used by 'dbg_check_old_index()'
* @old_zroot_sqnum: old index root sqnum - used by 'dbg_check_old_index()'
@@ -54,7 +53,6 @@
* dfs_dump_tnc: "dump TNC" debugfs knob
*/
struct ubifs_debug_info {
- void *buf;
struct ubifs_zbranch old_zroot;
int old_zroot_level;
unsigned long long old_zroot_sqnum;
@@ -173,7 +171,7 @@ const char *dbg_key_str1(const struct ubifs_info *c,
#define dbg_rcvry(fmt, ...) dbg_do_msg(UBIFS_MSG_RCVRY, fmt, ##__VA_ARGS__)
/*
- * Debugging message type flags (must match msg_type_names in debug.c).
+ * Debugging message type flags.
*
* UBIFS_MSG_GEN: general messages
* UBIFS_MSG_JNL: journal messages
@@ -205,14 +203,8 @@ enum {
UBIFS_MSG_RCVRY = 0x1000,
};
-/* Debugging message type flags for each default debug message level */
-#define UBIFS_MSG_LVL_0 0
-#define UBIFS_MSG_LVL_1 0x1
-#define UBIFS_MSG_LVL_2 0x7f
-#define UBIFS_MSG_LVL_3 0xffff
-
/*
- * Debugging check flags (must match chk_names in debug.c).
+ * Debugging check flags.
*
* UBIFS_CHK_GEN: general checks
* UBIFS_CHK_TNC: check TNC
@@ -233,7 +225,7 @@ enum {
};
/*
- * Special testing flags (must match tst_names in debug.c).
+ * Special testing flags.
*
* UBIFS_TST_FORCE_IN_THE_GAPS: force the use of in-the-gaps method
* UBIFS_TST_RCVRY: failure mode for recovery testing
@@ -243,22 +235,6 @@ enum {
UBIFS_TST_RCVRY = 0x4,
};
-#if CONFIG_UBIFS_FS_DEBUG_MSG_LVL == 1
-#define UBIFS_MSG_FLAGS_DEFAULT UBIFS_MSG_LVL_1
-#elif CONFIG_UBIFS_FS_DEBUG_MSG_LVL == 2
-#define UBIFS_MSG_FLAGS_DEFAULT UBIFS_MSG_LVL_2
-#elif CONFIG_UBIFS_FS_DEBUG_MSG_LVL == 3
-#define UBIFS_MSG_FLAGS_DEFAULT UBIFS_MSG_LVL_3
-#else
-#define UBIFS_MSG_FLAGS_DEFAULT UBIFS_MSG_LVL_0
-#endif
-
-#ifdef CONFIG_UBIFS_FS_DEBUG_CHKS
-#define UBIFS_CHK_FLAGS_DEFAULT 0xffffffff
-#else
-#define UBIFS_CHK_FLAGS_DEFAULT 0
-#endif
-
extern spinlock_t dbg_lock;
extern unsigned int ubifs_msg_flags;
diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index d82173182eeb..dfd168b7807e 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -31,6 +31,26 @@
* buffer is full or when it is not used for some time (by timer). This is
* similar to the mechanism is used by JFFS2.
*
+ * UBIFS distinguishes between minimum write size (@c->min_io_size) and maximum
+ * write size (@c->max_write_size). The latter is the maximum amount of bytes
+ * the underlying flash is able to program at a time, and writing in
+ * @c->max_write_size units should presumably be faster. Obviously,
+ * @c->min_io_size <= @c->max_write_size. Write-buffers are of
+ * @c->max_write_size bytes in size for maximum performance. However, when a
+ * write-buffer is flushed, only the portion of it (aligned to @c->min_io_size
+ * boundary) which contains data is written, not the whole write-buffer,
+ * because this is more space-efficient.
+ *
+ * This optimization adds few complications to the code. Indeed, on the one
+ * hand, we want to write in optimal @c->max_write_size bytes chunks, which
+ * also means aligning writes at the @c->max_write_size bytes offsets. On the
+ * other hand, we do not want to waste space when synchronizing the write
+ * buffer, so during synchronization we writes in smaller chunks. And this makes
+ * the next write offset to be not aligned to @c->max_write_size bytes. So the
+ * have to make sure that the write-buffer offset (@wbuf->offs) becomes aligned
+ * to @c->max_write_size bytes again. We do this by temporarily shrinking
+ * write-buffer size (@wbuf->size).
+ *
* Write-buffers are defined by 'struct ubifs_wbuf' objects and protected by
* mutexes defined inside these objects. Since sometimes upper-level code
* has to lock the write-buffer (e.g. journal space reservation code), many
@@ -46,8 +66,8 @@
* UBIFS uses padding when it pads to the next min. I/O unit. In this case it
* uses padding nodes or padding bytes, if the padding node does not fit.
*
- * All UBIFS nodes are protected by CRC checksums and UBIFS checks all nodes
- * every time they are read from the flash media.
+ * All UBIFS nodes are protected by CRC checksums and UBIFS checks CRC when
+ * they are read from the flash media.
*/
#include <linux/crc32.h>
@@ -88,8 +108,12 @@ void ubifs_ro_mode(struct ubifs_info *c, int err)
* This function may skip data nodes CRC checking if @c->no_chk_data_crc is
* true, which is controlled by corresponding UBIFS mount option. However, if
* @must_chk_crc is true, then @c->no_chk_data_crc is ignored and CRC is
- * checked. Similarly, if @c->always_chk_crc is true, @c->no_chk_data_crc is
- * ignored and CRC is checked.
+ * checked. Similarly, if @c->mounting or @c->remounting_rw is true (we are
+ * mounting or re-mounting to R/W mode), @c->no_chk_data_crc is ignored and CRC
+ * is checked. This is because during mounting or re-mounting from R/O mode to
+ * R/W mode we may read journal nodes (when replying the journal or doing the
+ * recovery) and the journal nodes may potentially be corrupted, so checking is
+ * required.
*
* This function returns zero in case of success and %-EUCLEAN in case of bad
* CRC or magic.
@@ -131,8 +155,8 @@ int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
node_len > c->ranges[type].max_len)
goto out_len;
- if (!must_chk_crc && type == UBIFS_DATA_NODE && !c->always_chk_crc &&
- c->no_chk_data_crc)
+ if (!must_chk_crc && type == UBIFS_DATA_NODE && !c->mounting &&
+ !c->remounting_rw && c->no_chk_data_crc)
return 0;
crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8);
@@ -343,11 +367,17 @@ static void cancel_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
*
* This function synchronizes write-buffer @buf and returns zero in case of
* success or a negative error code in case of failure.
+ *
+ * Note, although write-buffers are of @c->max_write_size, this function does
+ * not necessarily writes all @c->max_write_size bytes to the flash. Instead,
+ * if the write-buffer is only partially filled with data, only the used part
+ * of the write-buffer (aligned on @c->min_io_size boundary) is synchronized.
+ * This way we waste less space.
*/
int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf)
{
struct ubifs_info *c = wbuf->c;
- int err, dirt;
+ int err, dirt, sync_len;
cancel_wbuf_timer_nolock(wbuf);
if (!wbuf->used || wbuf->lnum == -1)
@@ -357,27 +387,53 @@ int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf)
dbg_io("LEB %d:%d, %d bytes, jhead %s",
wbuf->lnum, wbuf->offs, wbuf->used, dbg_jhead(wbuf->jhead));
ubifs_assert(!(wbuf->avail & 7));
- ubifs_assert(wbuf->offs + c->min_io_size <= c->leb_size);
+ ubifs_assert(wbuf->offs + wbuf->size <= c->leb_size);
+ ubifs_assert(wbuf->size >= c->min_io_size);
+ ubifs_assert(wbuf->size <= c->max_write_size);
+ ubifs_assert(wbuf->size % c->min_io_size == 0);
ubifs_assert(!c->ro_media && !c->ro_mount);
+ if (c->leb_size - wbuf->offs >= c->max_write_size)
+ ubifs_assert(!((wbuf->offs + wbuf->size) % c->max_write_size ));
if (c->ro_error)
return -EROFS;
- ubifs_pad(c, wbuf->buf + wbuf->used, wbuf->avail);
+ /*
+ * Do not write whole write buffer but write only the minimum necessary
+ * amount of min. I/O units.
+ */
+ sync_len = ALIGN(wbuf->used, c->min_io_size);
+ dirt = sync_len - wbuf->used;
+ if (dirt)
+ ubifs_pad(c, wbuf->buf + wbuf->used, dirt);
err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf, wbuf->offs,
- c->min_io_size, wbuf->dtype);
+ sync_len, wbuf->dtype);
if (err) {
ubifs_err("cannot write %d bytes to LEB %d:%d",
- c->min_io_size, wbuf->lnum, wbuf->offs);
+ sync_len, wbuf->lnum, wbuf->offs);
dbg_dump_stack();
return err;
}
- dirt = wbuf->avail;
-
spin_lock(&wbuf->lock);
- wbuf->offs += c->min_io_size;
- wbuf->avail = c->min_io_size;
+ wbuf->offs += sync_len;
+ /*
+ * Now @wbuf->offs is not necessarily aligned to @c->max_write_size.
+ * But our goal is to optimize writes and make sure we write in
+ * @c->max_write_size chunks and to @c->max_write_size-aligned offset.
+ * Thus, if @wbuf->offs is not aligned to @c->max_write_size now, make
+ * sure that @wbuf->offs + @wbuf->size is aligned to
+ * @c->max_write_size. This way we make sure that after next
+ * write-buffer flush we are again at the optimal offset (aligned to
+ * @c->max_write_size).
+ */
+ if (c->leb_size - wbuf->offs < c->max_write_size)
+ wbuf->size = c->leb_size - wbuf->offs;
+ else if (wbuf->offs & (c->max_write_size - 1))
+ wbuf->size = ALIGN(wbuf->offs, c->max_write_size) - wbuf->offs;
+ else
+ wbuf->size = c->max_write_size;
+ wbuf->avail = wbuf->size;
wbuf->used = 0;
wbuf->next_ino = 0;
spin_unlock(&wbuf->lock);
@@ -420,7 +476,13 @@ int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs,
spin_lock(&wbuf->lock);
wbuf->lnum = lnum;
wbuf->offs = offs;
- wbuf->avail = c->min_io_size;
+ if (c->leb_size - wbuf->offs < c->max_write_size)
+ wbuf->size = c->leb_size - wbuf->offs;
+ else if (wbuf->offs & (c->max_write_size - 1))
+ wbuf->size = ALIGN(wbuf->offs, c->max_write_size) - wbuf->offs;
+ else
+ wbuf->size = c->max_write_size;
+ wbuf->avail = wbuf->size;
wbuf->used = 0;
spin_unlock(&wbuf->lock);
wbuf->dtype = dtype;
@@ -500,8 +562,9 @@ out_timers:
*
* This function writes data to flash via write-buffer @wbuf. This means that
* the last piece of the node won't reach the flash media immediately if it
- * does not take whole minimal I/O unit. Instead, the node will sit in RAM
- * until the write-buffer is synchronized (e.g., by timer).
+ * does not take whole max. write unit (@c->max_write_size). Instead, the node
+ * will sit in RAM until the write-buffer is synchronized (e.g., by timer, or
+ * because more data are appended to the write-buffer).
*
* This function returns zero in case of success and a negative error code in
* case of failure. If the node cannot be written because there is no more
@@ -518,9 +581,14 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
ubifs_assert(len > 0 && wbuf->lnum >= 0 && wbuf->lnum < c->leb_cnt);
ubifs_assert(wbuf->offs >= 0 && wbuf->offs % c->min_io_size == 0);
ubifs_assert(!(wbuf->offs & 7) && wbuf->offs <= c->leb_size);
- ubifs_assert(wbuf->avail > 0 && wbuf->avail <= c->min_io_size);
+ ubifs_assert(wbuf->avail > 0 && wbuf->avail <= wbuf->size);
+ ubifs_assert(wbuf->size >= c->min_io_size);
+ ubifs_assert(wbuf->size <= c->max_write_size);
+ ubifs_assert(wbuf->size % c->min_io_size == 0);
ubifs_assert(mutex_is_locked(&wbuf->io_mutex));
ubifs_assert(!c->ro_media && !c->ro_mount);
+ if (c->leb_size - wbuf->offs >= c->max_write_size)
+ ubifs_assert(!((wbuf->offs + wbuf->size) % c->max_write_size ));
if (c->leb_size - wbuf->offs - wbuf->used < aligned_len) {
err = -ENOSPC;
@@ -543,14 +611,18 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
dbg_io("flush jhead %s wbuf to LEB %d:%d",
dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs);
err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf,
- wbuf->offs, c->min_io_size,
+ wbuf->offs, wbuf->size,
wbuf->dtype);
if (err)
goto out;
spin_lock(&wbuf->lock);
- wbuf->offs += c->min_io_size;
- wbuf->avail = c->min_io_size;
+ wbuf->offs += wbuf->size;
+ if (c->leb_size - wbuf->offs >= c->max_write_size)
+ wbuf->size = c->max_write_size;
+ else
+ wbuf->size = c->leb_size - wbuf->offs;
+ wbuf->avail = wbuf->size;
wbuf->used = 0;
wbuf->next_ino = 0;
spin_unlock(&wbuf->lock);
@@ -564,33 +636,57 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
goto exit;
}
- /*
- * The node is large enough and does not fit entirely within current
- * minimal I/O unit. We have to fill and flush write-buffer and switch
- * to the next min. I/O unit.
- */
- dbg_io("flush jhead %s wbuf to LEB %d:%d",
- dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs);
- memcpy(wbuf->buf + wbuf->used, buf, wbuf->avail);
- err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf, wbuf->offs,
- c->min_io_size, wbuf->dtype);
- if (err)
- goto out;
+ offs = wbuf->offs;
+ written = 0;
- offs = wbuf->offs + c->min_io_size;
- len -= wbuf->avail;
- aligned_len -= wbuf->avail;
- written = wbuf->avail;
+ if (wbuf->used) {
+ /*
+ * The node is large enough and does not fit entirely within
+ * current available space. We have to fill and flush
+ * write-buffer and switch to the next max. write unit.
+ */
+ dbg_io("flush jhead %s wbuf to LEB %d:%d",
+ dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs);
+ memcpy(wbuf->buf + wbuf->used, buf, wbuf->avail);
+ err = ubi_leb_write(c->ubi, wbuf->lnum, wbuf->buf, wbuf->offs,
+ wbuf->size, wbuf->dtype);
+ if (err)
+ goto out;
+
+ offs += wbuf->size;
+ len -= wbuf->avail;
+ aligned_len -= wbuf->avail;
+ written += wbuf->avail;
+ } else if (wbuf->offs & (c->max_write_size - 1)) {
+ /*
+ * The write-buffer offset is not aligned to
+ * @c->max_write_size and @wbuf->size is less than
+ * @c->max_write_size. Write @wbuf->size bytes to make sure the
+ * following writes are done in optimal @c->max_write_size
+ * chunks.
+ */
+ dbg_io("write %d bytes to LEB %d:%d",
+ wbuf->size, wbuf->lnum, wbuf->offs);
+ err = ubi_leb_write(c->ubi, wbuf->lnum, buf, wbuf->offs,
+ wbuf->size, wbuf->dtype);
+ if (err)
+ goto out;
+
+ offs += wbuf->size;
+ len -= wbuf->size;
+ aligned_len -= wbuf->size;
+ written += wbuf->size;
+ }
/*
- * The remaining data may take more whole min. I/O units, so write the
- * remains multiple to min. I/O unit size directly to the flash media.
+ * The remaining data may take more whole max. write units, so write the
+ * remains multiple to max. write unit size directly to the flash media.
* We align node length to 8-byte boundary because we anyway flash wbuf
* if the remaining space is less than 8 bytes.
*/
- n = aligned_len >> c->min_io_shift;
+ n = aligned_len >> c->max_write_shift;
if (n) {
- n <<= c->min_io_shift;
+ n <<= c->max_write_shift;
dbg_io("write %d bytes to LEB %d:%d", n, wbuf->lnum, offs);
err = ubi_leb_write(c->ubi, wbuf->lnum, buf + written, offs, n,
wbuf->dtype);
@@ -606,14 +702,18 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
if (aligned_len)
/*
* And now we have what's left and what does not take whole
- * min. I/O unit, so write it to the write-buffer and we are
+ * max. write unit, so write it to the write-buffer and we are
* done.
*/
memcpy(wbuf->buf, buf + written, len);
wbuf->offs = offs;
+ if (c->leb_size - wbuf->offs >= c->max_write_size)
+ wbuf->size = c->max_write_size;
+ else
+ wbuf->size = c->leb_size - wbuf->offs;
+ wbuf->avail = wbuf->size - aligned_len;
wbuf->used = aligned_len;
- wbuf->avail = c->min_io_size - aligned_len;
wbuf->next_ino = 0;
spin_unlock(&wbuf->lock);
@@ -837,11 +937,11 @@ int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
{
size_t size;
- wbuf->buf = kmalloc(c->min_io_size, GFP_KERNEL);
+ wbuf->buf = kmalloc(c->max_write_size, GFP_KERNEL);
if (!wbuf->buf)
return -ENOMEM;
- size = (c->min_io_size / UBIFS_CH_SZ + 1) * sizeof(ino_t);
+ size = (c->max_write_size / UBIFS_CH_SZ + 1) * sizeof(ino_t);
wbuf->inodes = kmalloc(size, GFP_KERNEL);
if (!wbuf->inodes) {
kfree(wbuf->buf);
@@ -851,7 +951,14 @@ int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
wbuf->used = 0;
wbuf->lnum = wbuf->offs = -1;
- wbuf->avail = c->min_io_size;
+ /*
+ * If the LEB starts at the max. write size aligned address, then
+ * write-buffer size has to be set to @c->max_write_size. Otherwise,
+ * set it to something smaller so that it ends at the closest max.
+ * write size boundary.
+ */
+ size = c->max_write_size - (c->leb_start % c->max_write_size);
+ wbuf->avail = wbuf->size = size;
wbuf->dtype = UBI_UNKNOWN;
wbuf->sync_callback = NULL;
mutex_init(&wbuf->io_mutex);
diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index 914f1bd89e57..aed25e864227 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -690,7 +690,7 @@ int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode,
{
struct ubifs_data_node *data;
int err, lnum, offs, compr_type, out_len;
- int dlen = UBIFS_DATA_NODE_SZ + UBIFS_BLOCK_SIZE * WORST_COMPR_FACTOR;
+ int dlen = COMPRESSED_DATA_NODE_BUF_SZ, allocated = 1;
struct ubifs_inode *ui = ubifs_inode(inode);
dbg_jnl("ino %lu, blk %u, len %d, key %s",
@@ -698,9 +698,19 @@ int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode,
DBGKEY(key));
ubifs_assert(len <= UBIFS_BLOCK_SIZE);
- data = kmalloc(dlen, GFP_NOFS);
- if (!data)
- return -ENOMEM;
+ data = kmalloc(dlen, GFP_NOFS | __GFP_NOWARN);
+ if (!data) {
+ /*
+ * Fall-back to the write reserve buffer. Note, we might be
+ * currently on the memory reclaim path, when the kernel is
+ * trying to free some memory by writing out dirty pages. The
+ * write reserve buffer helps us to guarantee that we are
+ * always able to write the data.
+ */
+ allocated = 0;
+ mutex_lock(&c->write_reserve_mutex);
+ data = c->write_reserve_buf;
+ }
data->ch.node_type = UBIFS_DATA_NODE;
key_write(c, key, &data->key);
@@ -736,7 +746,10 @@ int ubifs_jnl_write_data(struct ubifs_info *c, const struct inode *inode,
goto out_ro;
finish_reservation(c);
- kfree(data);
+ if (!allocated)
+ mutex_unlock(&c->write_reserve_mutex);
+ else
+ kfree(data);
return 0;
out_release:
@@ -745,7 +758,10 @@ out_ro:
ubifs_ro_mode(c, err);
finish_reservation(c);
out_free:
- kfree(data);
+ if (!allocated)
+ mutex_unlock(&c->write_reserve_mutex);
+ else
+ kfree(data);
return err;
}
diff --git a/fs/ubifs/lprops.c b/fs/ubifs/lprops.c
index 4d4ca388889b..c7b25e2f7764 100644
--- a/fs/ubifs/lprops.c
+++ b/fs/ubifs/lprops.c
@@ -1035,7 +1035,8 @@ static int scan_check_cb(struct ubifs_info *c,
struct ubifs_scan_leb *sleb;
struct ubifs_scan_node *snod;
struct ubifs_lp_stats *lst = &data->lst;
- int cat, lnum = lp->lnum, is_idx = 0, used = 0, free, dirty;
+ int cat, lnum = lp->lnum, is_idx = 0, used = 0, free, dirty, ret;
+ void *buf = NULL;
cat = lp->flags & LPROPS_CAT_MASK;
if (cat != LPROPS_UNCAT) {
@@ -1093,7 +1094,13 @@ static int scan_check_cb(struct ubifs_info *c,
}
}
- sleb = ubifs_scan(c, lnum, 0, c->dbg->buf, 0);
+ buf = __vmalloc(c->leb_size, GFP_KERNEL | GFP_NOFS, PAGE_KERNEL);
+ if (!buf) {
+ ubifs_err("cannot allocate memory to scan LEB %d", lnum);
+ goto out;
+ }
+
+ sleb = ubifs_scan(c, lnum, 0, buf, 0);
if (IS_ERR(sleb)) {
/*
* After an unclean unmount, empty and freeable LEBs
@@ -1105,7 +1112,8 @@ static int scan_check_cb(struct ubifs_info *c,
lst->empty_lebs += 1;
lst->total_free += c->leb_size;
lst->total_dark += ubifs_calc_dark(c, c->leb_size);
- return LPT_SCAN_CONTINUE;
+ ret = LPT_SCAN_CONTINUE;
+ goto exit;
}
if (lp->free + lp->dirty == c->leb_size &&
@@ -1115,10 +1123,12 @@ static int scan_check_cb(struct ubifs_info *c,
lst->total_free += lp->free;
lst->total_dirty += lp->dirty;
lst->total_dark += ubifs_calc_dark(c, c->leb_size);
- return LPT_SCAN_CONTINUE;
+ ret = LPT_SCAN_CONTINUE;
+ goto exit;
}
data->err = PTR_ERR(sleb);
- return LPT_SCAN_STOP;
+ ret = LPT_SCAN_STOP;
+ goto exit;
}
is_idx = -1;
@@ -1236,7 +1246,10 @@ static int scan_check_cb(struct ubifs_info *c,
}
ubifs_scan_destroy(sleb);
- return LPT_SCAN_CONTINUE;
+ ret = LPT_SCAN_CONTINUE;
+exit:
+ vfree(buf);
+ return ret;
out_print:
ubifs_err("bad accounting of LEB %d: free %d, dirty %d flags %#x, "
@@ -1246,6 +1259,7 @@ out_print:
out_destroy:
ubifs_scan_destroy(sleb);
out:
+ vfree(buf);
data->err = -EINVAL;
return LPT_SCAN_STOP;
}
diff --git a/fs/ubifs/lpt_commit.c b/fs/ubifs/lpt_commit.c
index 5c90dec5db0b..0a3c2c3f5c4a 100644
--- a/fs/ubifs/lpt_commit.c
+++ b/fs/ubifs/lpt_commit.c
@@ -1628,29 +1628,35 @@ static int dbg_check_ltab_lnum(struct ubifs_info *c, int lnum)
{
int err, len = c->leb_size, dirty = 0, node_type, node_num, node_len;
int ret;
- void *buf = c->dbg->buf;
+ void *buf, *p;
if (!(ubifs_chk_flags & UBIFS_CHK_LPROPS))
return 0;
+ buf = p = __vmalloc(c->leb_size, GFP_KERNEL | GFP_NOFS, PAGE_KERNEL);
+ if (!buf) {
+ ubifs_err("cannot allocate memory for ltab checking");
+ return 0;
+ }
+
dbg_lp("LEB %d", lnum);
err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size);
if (err) {
dbg_msg("ubi_read failed, LEB %d, error %d", lnum, err);
- return err;
+ goto out;
}
while (1) {
- if (!is_a_node(c, buf, len)) {
+ if (!is_a_node(c, p, len)) {
int i, pad_len;
- pad_len = get_pad_len(c, buf, len);
+ pad_len = get_pad_len(c, p, len);
if (pad_len) {
- buf += pad_len;
+ p += pad_len;
len -= pad_len;
dirty += pad_len;
continue;
}
- if (!dbg_is_all_ff(buf, len)) {
+ if (!dbg_is_all_ff(p, len)) {
dbg_msg("invalid empty space in LEB %d at %d",
lnum, c->leb_size - len);
err = -EINVAL;
@@ -1668,16 +1674,21 @@ static int dbg_check_ltab_lnum(struct ubifs_info *c, int lnum)
lnum, dirty, c->ltab[i].dirty);
err = -EINVAL;
}
- return err;
+ goto out;
}
- node_type = get_lpt_node_type(c, buf, &node_num);
+ node_type = get_lpt_node_type(c, p, &node_num);
node_len = get_lpt_node_len(c, node_type);
ret = dbg_is_node_dirty(c, node_type, lnum, c->leb_size - len);
if (ret == 1)
dirty += node_len;
- buf += node_len;
+ p += node_len;
len -= node_len;
}
+
+ err = 0;
+out:
+ vfree(buf);
+ return err;
}
/**
@@ -1870,25 +1881,31 @@ int dbg_chk_lpt_sz(struct ubifs_info *c, int action, int len)
static void dump_lpt_leb(const struct ubifs_info *c, int lnum)
{
int err, len = c->leb_size, node_type, node_num, node_len, offs;
- void *buf = c->dbg->buf;
+ void *buf, *p;
printk(KERN_DEBUG "(pid %d) start dumping LEB %d\n",
current->pid, lnum);
+ buf = p = __vmalloc(c->leb_size, GFP_KERNEL | GFP_NOFS, PAGE_KERNEL);
+ if (!buf) {
+ ubifs_err("cannot allocate memory to dump LPT");
+ return;
+ }
+
err = ubi_read(c->ubi, lnum, buf, 0, c->leb_size);
if (err) {
ubifs_err("cannot read LEB %d, error %d", lnum, err);
- return;
+ goto out;
}
while (1) {
offs = c->leb_size - len;
- if (!is_a_node(c, buf, len)) {
+ if (!is_a_node(c, p, len)) {
int pad_len;
- pad_len = get_pad_len(c, buf, len);
+ pad_len = get_pad_len(c, p, len);
if (pad_len) {
printk(KERN_DEBUG "LEB %d:%d, pad %d bytes\n",
lnum, offs, pad_len);
- buf += pad_len;
+ p += pad_len;
len -= pad_len;
continue;
}
@@ -1898,7 +1915,7 @@ static void dump_lpt_leb(const struct ubifs_info *c, int lnum)
break;
}
- node_type = get_lpt_node_type(c, buf, &node_num);
+ node_type = get_lpt_node_type(c, p, &node_num);
switch (node_type) {
case UBIFS_LPT_PNODE:
{
@@ -1923,7 +1940,7 @@ static void dump_lpt_leb(const struct ubifs_info *c, int lnum)
else
printk(KERN_DEBUG "LEB %d:%d, nnode, ",
lnum, offs);
- err = ubifs_unpack_nnode(c, buf, &nnode);
+ err = ubifs_unpack_nnode(c, p, &nnode);
for (i = 0; i < UBIFS_LPT_FANOUT; i++) {
printk(KERN_CONT "%d:%d", nnode.nbranch[i].lnum,
nnode.nbranch[i].offs);
@@ -1944,15 +1961,18 @@ static void dump_lpt_leb(const struct ubifs_info *c, int lnum)
break;
default:
ubifs_err("LPT node type %d not recognized", node_type);
- return;
+ goto out;
}
- buf += node_len;
+ p += node_len;
len -= node_len;
}
printk(KERN_DEBUG "(pid %d) finish dumping LEB %d\n",
current->pid, lnum);
+out:
+ vfree(buf);
+ return;
}
/**
diff --git a/fs/ubifs/orphan.c b/fs/ubifs/orphan.c
index 82009c74b6a3..2cdbd31641d7 100644
--- a/fs/ubifs/orphan.c
+++ b/fs/ubifs/orphan.c
@@ -892,15 +892,22 @@ static int dbg_read_orphans(struct check_info *ci, struct ubifs_scan_leb *sleb)
static int dbg_scan_orphans(struct ubifs_info *c, struct check_info *ci)
{
int lnum, err = 0;
+ void *buf;
/* Check no-orphans flag and skip this if no orphans */
if (c->no_orphs)
return 0;
+ buf = __vmalloc(c->leb_size, GFP_KERNEL | GFP_NOFS, PAGE_KERNEL);
+ if (!buf) {
+ ubifs_err("cannot allocate memory to check orphans");
+ return 0;
+ }
+
for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) {
struct ubifs_scan_leb *sleb;
- sleb = ubifs_scan(c, lnum, 0, c->dbg->buf, 0);
+ sleb = ubifs_scan(c, lnum, 0, buf, 0);
if (IS_ERR(sleb)) {
err = PTR_ERR(sleb);
break;
@@ -912,6 +919,7 @@ static int dbg_scan_orphans(struct ubifs_info *c, struct check_info *ci)
break;
}
+ vfree(buf);
return err;
}
diff --git a/fs/ubifs/recovery.c b/fs/ubifs/recovery.c
index 77e9b874b6c2..936f2cbfe6b6 100644
--- a/fs/ubifs/recovery.c
+++ b/fs/ubifs/recovery.c
@@ -28,6 +28,23 @@
* UBIFS always cleans away all remnants of an unclean un-mount, so that
* errors do not accumulate. However UBIFS defers recovery if it is mounted
* read-only, and the flash is not modified in that case.
+ *
+ * The general UBIFS approach to the recovery is that it recovers from
+ * corruptions which could be caused by power cuts, but it refuses to recover
+ * from corruption caused by other reasons. And UBIFS tries to distinguish
+ * between these 2 reasons of corruptions and silently recover in the former
+ * case and loudly complain in the latter case.
+ *
+ * UBIFS writes only to erased LEBs, so it writes only to the flash space
+ * containing only 0xFFs. UBIFS also always writes strictly from the beginning
+ * of the LEB to the end. And UBIFS assumes that the underlying flash media
+ * writes in @c->max_write_size bytes at a time.
+ *
+ * Hence, if UBIFS finds a corrupted node at offset X, it expects only the min.
+ * I/O unit corresponding to offset X to contain corrupted data, all the
+ * following min. I/O units have to contain empty space (all 0xFFs). If this is
+ * not true, the corruption cannot be the result of a power cut, and UBIFS
+ * refuses to mount.
*/
#include <linux/crc32.h>
@@ -362,8 +379,9 @@ int ubifs_write_rcvrd_mst_node(struct ubifs_info *c)
* @offs: offset to check
*
* This function returns %1 if @offs was in the last write to the LEB whose data
- * is in @buf, otherwise %0 is returned. The determination is made by checking
- * for subsequent empty space starting from the next @c->min_io_size boundary.
+ * is in @buf, otherwise %0 is returned. The determination is made by checking
+ * for subsequent empty space starting from the next @c->max_write_size
+ * boundary.
*/
static int is_last_write(const struct ubifs_info *c, void *buf, int offs)
{
@@ -371,10 +389,10 @@ static int is_last_write(const struct ubifs_info *c, void *buf, int offs)
uint8_t *p;
/*
- * Round up to the next @c->min_io_size boundary i.e. @offs is in the
- * last wbuf written. After that should be empty space.
+ * Round up to the next @c->max_write_size boundary i.e. @offs is in
+ * the last wbuf written. After that should be empty space.
*/
- empty_offs = ALIGN(offs + 1, c->min_io_size);
+ empty_offs = ALIGN(offs + 1, c->max_write_size);
check_len = c->leb_size - empty_offs;
p = buf + empty_offs - offs;
return is_empty(p, check_len);
@@ -429,7 +447,7 @@ static int no_more_nodes(const struct ubifs_info *c, void *buf, int len,
int skip, dlen = le32_to_cpu(ch->len);
/* Check for empty space after the corrupt node's common header */
- skip = ALIGN(offs + UBIFS_CH_SZ, c->min_io_size) - offs;
+ skip = ALIGN(offs + UBIFS_CH_SZ, c->max_write_size) - offs;
if (is_empty(buf + skip, len - skip))
return 1;
/*
@@ -441,7 +459,7 @@ static int no_more_nodes(const struct ubifs_info *c, void *buf, int len,
return 0;
}
/* Now we know the corrupt node's length we can skip over it */
- skip = ALIGN(offs + dlen, c->min_io_size) - offs;
+ skip = ALIGN(offs + dlen, c->max_write_size) - offs;
/* After which there should be empty space */
if (is_empty(buf + skip, len - skip))
return 1;
@@ -671,10 +689,14 @@ struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum,
} else {
int corruption = first_non_ff(buf, len);
+ /*
+ * See header comment for this file for more
+ * explanations about the reasons we have this check.
+ */
ubifs_err("corrupt empty space LEB %d:%d, corruption "
"starts at %d", lnum, offs, corruption);
/* Make sure we dump interesting non-0xFF data */
- offs = corruption;
+ offs += corruption;
buf += corruption;
goto corrupted;
}
@@ -836,12 +858,8 @@ struct ubifs_scan_leb *ubifs_recover_log_leb(struct ubifs_info *c, int lnum,
static int recover_head(const struct ubifs_info *c, int lnum, int offs,
void *sbuf)
{
- int len, err;
+ int len = c->max_write_size, err;
- if (c->min_io_size > 1)
- len = c->min_io_size;
- else
- len = 512;
if (offs + len > c->leb_size)
len = c->leb_size - offs;
diff --git a/fs/ubifs/scan.c b/fs/ubifs/scan.c
index 3e1ee57dbeaa..36216b46f772 100644
--- a/fs/ubifs/scan.c
+++ b/fs/ubifs/scan.c
@@ -328,7 +328,7 @@ struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
if (!quiet)
ubifs_err("empty space starts at non-aligned offset %d",
offs);
- goto corrupted;;
+ goto corrupted;
}
ubifs_end_scan(c, sleb, lnum, offs);
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 6e11c2975dcf..e5dc1e120e8d 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -512,9 +512,12 @@ static int init_constants_early(struct ubifs_info *c)
c->leb_cnt = c->vi.size;
c->leb_size = c->vi.usable_leb_size;
+ c->leb_start = c->di.leb_start;
c->half_leb_size = c->leb_size / 2;
c->min_io_size = c->di.min_io_size;
c->min_io_shift = fls(c->min_io_size) - 1;
+ c->max_write_size = c->di.max_write_size;
+ c->max_write_shift = fls(c->max_write_size) - 1;
if (c->leb_size < UBIFS_MIN_LEB_SZ) {
ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
@@ -534,6 +537,18 @@ static int init_constants_early(struct ubifs_info *c)
}
/*
+ * Maximum write size has to be greater or equivalent to min. I/O
+ * size, and be multiple of min. I/O size.
+ */
+ if (c->max_write_size < c->min_io_size ||
+ c->max_write_size % c->min_io_size ||
+ !is_power_of_2(c->max_write_size)) {
+ ubifs_err("bad write buffer size %d for %d min. I/O unit",
+ c->max_write_size, c->min_io_size);
+ return -EINVAL;
+ }
+
+ /*
* UBIFS aligns all node to 8-byte boundary, so to make function in
* io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
* less than 8.
@@ -541,6 +556,10 @@ static int init_constants_early(struct ubifs_info *c)
if (c->min_io_size < 8) {
c->min_io_size = 8;
c->min_io_shift = 3;
+ if (c->max_write_size < c->min_io_size) {
+ c->max_write_size = c->min_io_size;
+ c->max_write_shift = c->min_io_shift;
+ }
}
c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
@@ -1202,11 +1221,14 @@ static int mount_ubifs(struct ubifs_info *c)
if (c->bulk_read == 1)
bu_init(c);
- /*
- * We have to check all CRCs, even for data nodes, when we mount the FS
- * (specifically, when we are replaying).
- */
- c->always_chk_crc = 1;
+ if (!c->ro_mount) {
+ c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ,
+ GFP_KERNEL);
+ if (!c->write_reserve_buf)
+ goto out_free;
+ }
+
+ c->mounting = 1;
err = ubifs_read_superblock(c);
if (err)
@@ -1382,7 +1404,7 @@ static int mount_ubifs(struct ubifs_info *c)
if (err)
goto out_infos;
- c->always_chk_crc = 0;
+ c->mounting = 0;
ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"",
c->vi.ubi_num, c->vi.vol_id, c->vi.name);
@@ -1403,6 +1425,7 @@ static int mount_ubifs(struct ubifs_info *c)
dbg_msg("compiled on: " __DATE__ " at " __TIME__);
dbg_msg("min. I/O unit size: %d bytes", c->min_io_size);
+ dbg_msg("max. write size: %d bytes", c->max_write_size);
dbg_msg("LEB size: %d bytes (%d KiB)",
c->leb_size, c->leb_size >> 10);
dbg_msg("data journal heads: %d",
@@ -1432,9 +1455,9 @@ static int mount_ubifs(struct ubifs_info *c)
UBIFS_TRUN_NODE_SZ, UBIFS_SB_NODE_SZ, UBIFS_MST_NODE_SZ);
dbg_msg("node sizes: ref %zu, cmt. start %zu, orph %zu",
UBIFS_REF_NODE_SZ, UBIFS_CS_NODE_SZ, UBIFS_ORPH_NODE_SZ);
- dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu",
+ dbg_msg("max. node sizes: data %zu, inode %zu dentry %zu, idx %d",
UBIFS_MAX_DATA_NODE_SZ, UBIFS_MAX_INO_NODE_SZ,
- UBIFS_MAX_DENT_NODE_SZ);
+ UBIFS_MAX_DENT_NODE_SZ, ubifs_idx_node_sz(c, c->fanout));
dbg_msg("dead watermark: %d", c->dead_wm);
dbg_msg("dark watermark: %d", c->dark_wm);
dbg_msg("LEB overhead: %d", c->leb_overhead);
@@ -1474,6 +1497,7 @@ out_wbufs:
out_cbuf:
kfree(c->cbuf);
out_free:
+ kfree(c->write_reserve_buf);
kfree(c->bu.buf);
vfree(c->ileb_buf);
vfree(c->sbuf);
@@ -1512,6 +1536,7 @@ static void ubifs_umount(struct ubifs_info *c)
kfree(c->cbuf);
kfree(c->rcvrd_mst_node);
kfree(c->mst_node);
+ kfree(c->write_reserve_buf);
kfree(c->bu.buf);
vfree(c->ileb_buf);
vfree(c->sbuf);
@@ -1543,7 +1568,6 @@ static int ubifs_remount_rw(struct ubifs_info *c)
mutex_lock(&c->umount_mutex);
dbg_save_space_info(c);
c->remounting_rw = 1;
- c->always_chk_crc = 1;
err = check_free_space(c);
if (err)
@@ -1598,6 +1622,10 @@ static int ubifs_remount_rw(struct ubifs_info *c)
goto out;
}
+ c->write_reserve_buf = kmalloc(COMPRESSED_DATA_NODE_BUF_SZ, GFP_KERNEL);
+ if (!c->write_reserve_buf)
+ goto out;
+
err = ubifs_lpt_init(c, 0, 1);
if (err)
goto out;
@@ -1650,7 +1678,6 @@ static int ubifs_remount_rw(struct ubifs_info *c)
dbg_gen("re-mounted read-write");
c->ro_mount = 0;
c->remounting_rw = 0;
- c->always_chk_crc = 0;
err = dbg_check_space_info(c);
mutex_unlock(&c->umount_mutex);
return err;
@@ -1663,11 +1690,12 @@ out:
c->bgt = NULL;
}
free_wbufs(c);
+ kfree(c->write_reserve_buf);
+ c->write_reserve_buf = NULL;
vfree(c->ileb_buf);
c->ileb_buf = NULL;
ubifs_lpt_free(c, 1);
c->remounting_rw = 0;
- c->always_chk_crc = 0;
mutex_unlock(&c->umount_mutex);
return err;
}
@@ -1707,6 +1735,8 @@ static void ubifs_remount_ro(struct ubifs_info *c)
free_wbufs(c);
vfree(c->orph_buf);
c->orph_buf = NULL;
+ kfree(c->write_reserve_buf);
+ c->write_reserve_buf = NULL;
vfree(c->ileb_buf);
c->ileb_buf = NULL;
ubifs_lpt_free(c, 1);
@@ -1937,6 +1967,7 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
mutex_init(&c->mst_mutex);
mutex_init(&c->umount_mutex);
mutex_init(&c->bu_mutex);
+ mutex_init(&c->write_reserve_mutex);
init_waitqueue_head(&c->cmt_wq);
c->buds = RB_ROOT;
c->old_idx = RB_ROOT;
@@ -1954,6 +1985,7 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
INIT_LIST_HEAD(&c->old_buds);
INIT_LIST_HEAD(&c->orph_list);
INIT_LIST_HEAD(&c->orph_new);
+ c->no_chk_data_crc = 1;
c->vfs_sb = sb;
c->highest_inum = UBIFS_FIRST_INO;
diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c
index ad9cf0133622..de485979ca39 100644
--- a/fs/ubifs/tnc.c
+++ b/fs/ubifs/tnc.c
@@ -447,8 +447,11 @@ static int tnc_read_node_nm(struct ubifs_info *c, struct ubifs_zbranch *zbr,
*
* Note, this function does not check CRC of data nodes if @c->no_chk_data_crc
* is true (it is controlled by corresponding mount option). However, if
- * @c->always_chk_crc is true, @c->no_chk_data_crc is ignored and CRC is always
- * checked.
+ * @c->mounting or @c->remounting_rw is true (we are mounting or re-mounting to
+ * R/W mode), @c->no_chk_data_crc is ignored and CRC is checked. This is
+ * because during mounting or re-mounting from R/O mode to R/W mode we may read
+ * journal nodes (when replying the journal or doing the recovery) and the
+ * journal nodes may potentially be corrupted, so checking is required.
*/
static int try_read_node(const struct ubifs_info *c, void *buf, int type,
int len, int lnum, int offs)
@@ -476,7 +479,8 @@ static int try_read_node(const struct ubifs_info *c, void *buf, int type,
if (node_len != len)
return 0;
- if (type == UBIFS_DATA_NODE && !c->always_chk_crc && c->no_chk_data_crc)
+ if (type == UBIFS_DATA_NODE && c->no_chk_data_crc && !c->mounting &&
+ !c->remounting_rw)
return 1;
crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8);
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index 381d6b207a52..8c40ad3c6721 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -151,6 +151,12 @@
*/
#define WORST_COMPR_FACTOR 2
+/*
+ * How much memory is needed for a buffer where we comress a data node.
+ */
+#define COMPRESSED_DATA_NODE_BUF_SZ \
+ (UBIFS_DATA_NODE_SZ + UBIFS_BLOCK_SIZE * WORST_COMPR_FACTOR)
+
/* Maximum expected tree height for use by bottom_up_buf */
#define BOTTOM_UP_HEIGHT 64
@@ -646,6 +652,7 @@ typedef int (*ubifs_lpt_scan_callback)(struct ubifs_info *c,
* @offs: write-buffer offset in this logical eraseblock
* @avail: number of bytes available in the write-buffer
* @used: number of used bytes in the write-buffer
+ * @size: write-buffer size (in [@c->min_io_size, @c->max_write_size] range)
* @dtype: type of data stored in this LEB (%UBI_LONGTERM, %UBI_SHORTTERM,
* %UBI_UNKNOWN)
* @jhead: journal head the mutex belongs to (note, needed only to shut lockdep
@@ -680,6 +687,7 @@ struct ubifs_wbuf {
int offs;
int avail;
int used;
+ int size;
int dtype;
int jhead;
int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad);
@@ -1003,6 +1011,11 @@ struct ubifs_debug_info;
* @bu_mutex: protects the pre-allocated bulk-read buffer and @c->bu
* @bu: pre-allocated bulk-read information
*
+ * @write_reserve_mutex: protects @write_reserve_buf
+ * @write_reserve_buf: on the write path we allocate memory, which might
+ * sometimes be unavailable, in which case we use this
+ * write reserve buffer
+ *
* @log_lebs: number of logical eraseblocks in the log
* @log_bytes: log size in bytes
* @log_last: last LEB of the log
@@ -1024,7 +1037,12 @@ struct ubifs_debug_info;
*
* @min_io_size: minimal input/output unit size
* @min_io_shift: number of bits in @min_io_size minus one
+ * @max_write_size: maximum amount of bytes the underlying flash can write at a
+ * time (MTD write buffer size)
+ * @max_write_shift: number of bits in @max_write_size minus one
* @leb_size: logical eraseblock size in bytes
+ * @leb_start: starting offset of logical eraseblocks within physical
+ * eraseblocks
* @half_leb_size: half LEB size
* @idx_leb_size: how many bytes of an LEB are effectively available when it is
* used to store indexing nodes (@leb_size - @max_idx_node_sz)
@@ -1166,22 +1184,21 @@ struct ubifs_debug_info;
* @rp_uid: reserved pool user ID
* @rp_gid: reserved pool group ID
*
- * @empty: if the UBI device is empty
+ * @empty: %1 if the UBI device is empty
+ * @need_recovery: %1 if the file-system needs recovery
+ * @replaying: %1 during journal replay
+ * @mounting: %1 while mounting
+ * @remounting_rw: %1 while re-mounting from R/O mode to R/W mode
* @replay_tree: temporary tree used during journal replay
* @replay_list: temporary list used during journal replay
* @replay_buds: list of buds to replay
* @cs_sqnum: sequence number of first node in the log (commit start node)
* @replay_sqnum: sequence number of node currently being replayed
- * @need_recovery: file-system needs recovery
- * @replaying: set to %1 during journal replay
* @unclean_leb_list: LEBs to recover when re-mounting R/O mounted FS to R/W
* mode
* @rcvrd_mst_node: recovered master node to write when re-mounting R/O mounted
* FS to R/W mode
* @size_tree: inode size information for recovery
- * @remounting_rw: set while re-mounting from R/O mode to R/W mode
- * @always_chk_crc: always check CRCs (while mounting and remounting to R/W
- * mode)
* @mount_opts: UBIFS-specific mount options
*
* @dbg: debugging-related information
@@ -1250,6 +1267,9 @@ struct ubifs_info {
struct mutex bu_mutex;
struct bu_info bu;
+ struct mutex write_reserve_mutex;
+ void *write_reserve_buf;
+
int log_lebs;
long long log_bytes;
int log_last;
@@ -1271,7 +1291,10 @@ struct ubifs_info {
int min_io_size;
int min_io_shift;
+ int max_write_size;
+ int max_write_shift;
int leb_size;
+ int leb_start;
int half_leb_size;
int idx_leb_size;
int leb_cnt;
@@ -1402,19 +1425,19 @@ struct ubifs_info {
gid_t rp_gid;
/* The below fields are used only during mounting and re-mounting */
- int empty;
+ unsigned int empty:1;
+ unsigned int need_recovery:1;
+ unsigned int replaying:1;
+ unsigned int mounting:1;
+ unsigned int remounting_rw:1;
struct rb_root replay_tree;
struct list_head replay_list;
struct list_head replay_buds;
unsigned long long cs_sqnum;
unsigned long long replay_sqnum;
- int need_recovery;
- int replaying;
struct list_head unclean_leb_list;
struct ubifs_mst_node *rcvrd_mst_node;
struct rb_root size_tree;
- int remounting_rw;
- int always_chk_crc;
struct ubifs_mount_opts mount_opts;
#ifdef CONFIG_UBIFS_FS_DEBUG