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authorLinus Torvalds <torvalds@linux-foundation.org>2012-04-17 13:30:34 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-17 13:30:34 -0700
commit592fe8980688e7cba46897685d014c7fb3018a67 (patch)
treeda0df053994838535a6d260eaacf32c84e2619ef /fs
parentd44c6d4fa9b3d9b4f6d8d1751d9cbc50ed53cffe (diff)
parent57f73c2c89a5d3b2ed87201c8100d1fa989a1a65 (diff)
downloadlinux-linaro-stable-592fe8980688e7cba46897685d014c7fb3018a67.tar.gz
Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
Pull ext4 regression fixes from Ted Ts'o: "This fixes a scalability problem reported by Andi Kleen and Tim Chen; they were quite secretive about the precise nature of their workload, but they later admitted that it only showed up when they were using a large sparse file, so the amount of data I/O that was needed was close to zero. I'm not sure how realistic this is and it's only a regression if you consider changes made since 2.6.39 to be a "regression" vis-a-vis the policy regarding post-merge window bug fixes, but Linus agreed it was worth fixing, so I'm including it in this pull request. This also fixes the journalled quota mount options, which I accidentally broke while I was cleaning up the mount option handling." * tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: fix handling of journalled quota options ext4: address scalability issue by removing extent cache statistics
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/ext4.h3
-rw-r--r--fs/ext4/extents.c4
-rw-r--r--fs/ext4/super.c48
3 files changed, 15 insertions, 40 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index ab2594a30f86..0e01e90add8b 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1203,9 +1203,6 @@ struct ext4_sb_info {
unsigned long s_ext_blocks;
unsigned long s_ext_extents;
#endif
- /* ext4 extent cache stats */
- unsigned long extent_cache_hits;
- unsigned long extent_cache_misses;
/* for buddy allocator */
struct ext4_group_info ***s_group_info;
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 1d418387ffb0..abcdeab67f52 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2066,10 +2066,6 @@ static int ext4_ext_check_cache(struct inode *inode, ext4_lblk_t block,
ret = 1;
}
errout:
- if (!ret)
- sbi->extent_cache_misses++;
- else
- sbi->extent_cache_hits++;
trace_ext4_ext_in_cache(inode, block, ret);
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
return ret;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ceebaf853beb..6da193564e43 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1305,20 +1305,20 @@ static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
ext4_msg(sb, KERN_ERR,
"Cannot change journaled "
"quota options when quota turned on");
- return 0;
+ return -1;
}
qname = match_strdup(args);
if (!qname) {
ext4_msg(sb, KERN_ERR,
"Not enough memory for storing quotafile name");
- return 0;
+ return -1;
}
if (sbi->s_qf_names[qtype] &&
strcmp(sbi->s_qf_names[qtype], qname)) {
ext4_msg(sb, KERN_ERR,
"%s quota file already specified", QTYPE2NAME(qtype));
kfree(qname);
- return 0;
+ return -1;
}
sbi->s_qf_names[qtype] = qname;
if (strchr(sbi->s_qf_names[qtype], '/')) {
@@ -1326,7 +1326,7 @@ static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
"quotafile must be on filesystem root");
kfree(sbi->s_qf_names[qtype]);
sbi->s_qf_names[qtype] = NULL;
- return 0;
+ return -1;
}
set_opt(sb, QUOTA);
return 1;
@@ -1341,7 +1341,7 @@ static int clear_qf_name(struct super_block *sb, int qtype)
sbi->s_qf_names[qtype]) {
ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
" when quota turned on");
- return 0;
+ return -1;
}
/*
* The space will be released later when all options are confirmed
@@ -1450,6 +1450,16 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
const struct mount_opts *m;
int arg = 0;
+#ifdef CONFIG_QUOTA
+ if (token == Opt_usrjquota)
+ return set_qf_name(sb, USRQUOTA, &args[0]);
+ else if (token == Opt_grpjquota)
+ return set_qf_name(sb, GRPQUOTA, &args[0]);
+ else if (token == Opt_offusrjquota)
+ return clear_qf_name(sb, USRQUOTA);
+ else if (token == Opt_offgrpjquota)
+ return clear_qf_name(sb, GRPQUOTA);
+#endif
if (args->from && match_int(args, &arg))
return -1;
switch (token) {
@@ -1549,18 +1559,6 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
sbi->s_mount_opt |= m->mount_opt;
}
#ifdef CONFIG_QUOTA
- } else if (token == Opt_usrjquota) {
- if (!set_qf_name(sb, USRQUOTA, &args[0]))
- return -1;
- } else if (token == Opt_grpjquota) {
- if (!set_qf_name(sb, GRPQUOTA, &args[0]))
- return -1;
- } else if (token == Opt_offusrjquota) {
- if (!clear_qf_name(sb, USRQUOTA))
- return -1;
- } else if (token == Opt_offgrpjquota) {
- if (!clear_qf_name(sb, GRPQUOTA))
- return -1;
} else if (m->flags & MOPT_QFMT) {
if (sb_any_quota_loaded(sb) &&
sbi->s_jquota_fmt != m->mount_opt) {
@@ -2366,18 +2364,6 @@ static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
EXT4_SB(sb)->s_sectors_written_start) >> 1)));
}
-static ssize_t extent_cache_hits_show(struct ext4_attr *a,
- struct ext4_sb_info *sbi, char *buf)
-{
- return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits);
-}
-
-static ssize_t extent_cache_misses_show(struct ext4_attr *a,
- struct ext4_sb_info *sbi, char *buf)
-{
- return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses);
-}
-
static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
struct ext4_sb_info *sbi,
const char *buf, size_t count)
@@ -2435,8 +2421,6 @@ static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
EXT4_RO_ATTR(delayed_allocation_blocks);
EXT4_RO_ATTR(session_write_kbytes);
EXT4_RO_ATTR(lifetime_write_kbytes);
-EXT4_RO_ATTR(extent_cache_hits);
-EXT4_RO_ATTR(extent_cache_misses);
EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
inode_readahead_blks_store, s_inode_readahead_blks);
EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
@@ -2452,8 +2436,6 @@ static struct attribute *ext4_attrs[] = {
ATTR_LIST(delayed_allocation_blocks),
ATTR_LIST(session_write_kbytes),
ATTR_LIST(lifetime_write_kbytes),
- ATTR_LIST(extent_cache_hits),
- ATTR_LIST(extent_cache_misses),
ATTR_LIST(inode_readahead_blks),
ATTR_LIST(inode_goal),
ATTR_LIST(mb_stats),