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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-11-19 11:53:15 +0200
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-11-21 18:59:33 +0200
commit3477d204658733aa3a87d3ae03b0327c1e599517 (patch)
tree1c9ba659f76c09a19b98f4bcbfac6fc67db43112 /fs/ubifs/super.c
parent6c0c42cdfd73fb161417403d8d077cb136e10bbf (diff)
downloadop-kernel-dev-3477d204658733aa3a87d3ae03b0327c1e599517.zip
op-kernel-dev-3477d204658733aa3a87d3ae03b0327c1e599517.tar.gz
UBIFS: pre-allocate bulk-read buffer
To avoid memory allocation failure during bulk-read, pre-allocate a bulk-read buffer, so that if there is only one bulk-reader at a time, it would just use the pre-allocated buffer and would not do any memory allocation. However, if there are more than 1 bulk- reader, then only one reader would use the pre-allocated buffer, while the other reader would allocate the buffer for itself. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'fs/ubifs/super.c')
-rw-r--r--fs/ubifs/super.c57
1 files changed, 48 insertions, 9 deletions
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 1d51156..d80b2ae 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -572,14 +572,6 @@ static int init_constants_early(struct ubifs_info *c)
c->max_bu_buf_len = UBIFS_MAX_BULK_READ * UBIFS_MAX_DATA_NODE_SZ;
if (c->max_bu_buf_len > c->leb_size)
c->max_bu_buf_len = c->leb_size;
- if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
- /* Check if we can kmalloc that much */
- void *try = kmalloc(c->max_bu_buf_len,
- GFP_KERNEL | __GFP_NOWARN);
- kfree(try);
- if (!try)
- c->max_bu_buf_len = UBIFS_KMALLOC_OK;
- }
return 0;
}
@@ -999,6 +991,34 @@ static void destroy_journal(struct ubifs_info *c)
}
/**
+ * bu_init - initialize bulk-read information.
+ * @c: UBIFS file-system description object
+ */
+static void bu_init(struct ubifs_info *c)
+{
+ ubifs_assert(c->bulk_read == 1);
+
+ if (c->bu.buf)
+ return; /* Already initialized */
+
+again:
+ c->bu.buf = kmalloc(c->max_bu_buf_len, GFP_KERNEL | __GFP_NOWARN);
+ if (!c->bu.buf) {
+ if (c->max_bu_buf_len > UBIFS_KMALLOC_OK) {
+ c->max_bu_buf_len = UBIFS_KMALLOC_OK;
+ goto again;
+ }
+
+ /* Just disable bulk-read */
+ ubifs_warn("Cannot allocate %d bytes of memory for bulk-read, "
+ "disabling it", c->max_bu_buf_len);
+ c->mount_opts.bulk_read = 1;
+ c->bulk_read = 0;
+ return;
+ }
+}
+
+/**
* mount_ubifs - mount UBIFS file-system.
* @c: UBIFS file-system description object
*
@@ -1066,6 +1086,13 @@ static int mount_ubifs(struct ubifs_info *c)
goto out_free;
}
+ 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;
err = ubifs_read_superblock(c);
@@ -1296,6 +1323,7 @@ out_cbuf:
out_dereg:
dbg_failure_mode_deregistration(c);
out_free:
+ kfree(c->bu.buf);
vfree(c->ileb_buf);
vfree(c->sbuf);
kfree(c->bottom_up_buf);
@@ -1332,10 +1360,11 @@ static void ubifs_umount(struct ubifs_info *c)
kfree(c->cbuf);
kfree(c->rcvrd_mst_node);
kfree(c->mst_node);
+ kfree(c->bu.buf);
+ vfree(c->ileb_buf);
vfree(c->sbuf);
kfree(c->bottom_up_buf);
UBIFS_DBG(vfree(c->dbg_buf));
- vfree(c->ileb_buf);
dbg_failure_mode_deregistration(c);
}
@@ -1633,6 +1662,7 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
ubifs_err("invalid or unknown remount parameter");
return err;
}
+
if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) {
err = ubifs_remount_rw(c);
if (err)
@@ -1640,6 +1670,14 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data)
} else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY))
ubifs_remount_ro(c);
+ if (c->bulk_read == 1)
+ bu_init(c);
+ else {
+ dbg_gen("disable bulk-read");
+ kfree(c->bu.buf);
+ c->bu.buf = NULL;
+ }
+
return 0;
}
@@ -1730,6 +1768,7 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
mutex_init(&c->log_mutex);
mutex_init(&c->mst_mutex);
mutex_init(&c->umount_mutex);
+ mutex_init(&c->bu_mutex);
init_waitqueue_head(&c->cmt_wq);
c->buds = RB_ROOT;
c->old_idx = RB_ROOT;
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