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UBIFS: harmonize znode flag helpers 

We have 3 znode flags: cow, obsolete, dirty. For the last flag we have a
'ubifs_zn_dirty()' helper function, but for the other 2 flags we use
'test_bit()' directly.

This patch makes the situation more consistent and introduces helpers for the
other 2 flags: 'ubifs_zn_cow()' and 'ubifs_zn_obsolete()'.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2011-05-30 14:45:30 +03:00 committed by Artem Bityutskiy
parent 1f42596ec0
commit f42eed7cba
4 changed files with 34 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/ubifs/commit.c
View File

@ -78,7 +78,7 @@ static int nothing_to_commit(struct ubifs_info *c)
* 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))
if (c->zroot.znode && ubifs_zn_dirty(c->zroot.znode))
return 0;
/*

23
fs/ubifs/misc.h
View File

@ -38,6 +38,29 @@ static inline int ubifs_zn_dirty(const struct ubifs_znode *znode)
return !!test_bit(DIRTY_ZNODE, &znode->flags);
}
/**
* ubifs_zn_obsolete - check if znode is obsolete.
* @znode: znode to check
*
* This helper function returns %1 if @znode is obsolete and %0 otherwise.
*/
static inline int ubifs_zn_obsolete(const struct ubifs_znode *znode)
{
return !!test_bit(OBSOLETE_ZNODE, &znode->flags);
}
/**
* ubifs_zn_cow - check if znode has to be copied on write.
* @znode: znode to check
*
* This helper function returns %1 if @znode is has COW flag set and %0
* otherwise.
*/
static inline int ubifs_zn_cow(const struct ubifs_znode *znode)
{
return !!test_bit(COW_ZNODE, &znode->flags);
}
/**
* ubifs_wake_up_bgt - wake up background thread.
* @c: UBIFS file-system description object

13
fs/ubifs/tnc.c
View File

@ -223,7 +223,7 @@ static struct ubifs_znode *copy_znode(struct ubifs_info *c,
__set_bit(DIRTY_ZNODE, &zn->flags);
__clear_bit(COW_ZNODE, &zn->flags);
ubifs_assert(!test_bit(OBSOLETE_ZNODE, &znode->flags));
ubifs_assert(!ubifs_zn_obsolete(znode));
__set_bit(OBSOLETE_ZNODE, &znode->flags);
if (znode->level != 0) {
@ -271,7 +271,7 @@ static struct ubifs_znode *dirty_cow_znode(struct ubifs_info *c,
struct ubifs_znode *zn;
int err;
if (!test_bit(COW_ZNODE, &znode->flags)) {
if (!ubifs_zn_cow(znode)) {
/* znode is not being committed */
if (!test_and_set_bit(DIRTY_ZNODE, &znode->flags)) {
atomic_long_inc(&c->dirty_zn_cnt);
@ -2423,7 +2423,7 @@ static int tnc_delete(struct ubifs_info *c, struct ubifs_znode *znode, int n)
*/
do {
ubifs_assert(!test_bit(OBSOLETE_ZNODE, &znode->flags));
ubifs_assert(!ubifs_zn_obsolete(znode));
ubifs_assert(ubifs_zn_dirty(znode));
zp = znode->parent;
@ -2479,9 +2479,8 @@ static int tnc_delete(struct ubifs_info *c, struct ubifs_znode *znode, int n)
c->zroot.offs = zbr->offs;
c->zroot.len = zbr->len;
c->zroot.znode = znode;
ubifs_assert(!test_bit(OBSOLETE_ZNODE,
&zp->flags));
ubifs_assert(test_bit(DIRTY_ZNODE, &zp->flags));
ubifs_assert(!ubifs_zn_obsolete(zp));
ubifs_assert(ubifs_zn_dirty(zp));
atomic_long_dec(&c->dirty_zn_cnt);
if (zp->cnext) {
@ -2865,7 +2864,7 @@ static void tnc_destroy_cnext(struct ubifs_info *c)
struct ubifs_znode *znode = cnext;
cnext = cnext->cnext;
if (test_bit(OBSOLETE_ZNODE, &znode->flags))
if (ubifs_zn_obsolete(znode))
kfree(znode);
} while (cnext && cnext != c->cnext);
}

8
fs/ubifs/tnc_commit.c
View File

@ -87,7 +87,7 @@ static int make_idx_node(struct ubifs_info *c, struct ubifs_idx_node *idx,
atomic_long_dec(&c->dirty_zn_cnt);
ubifs_assert(ubifs_zn_dirty(znode));
ubifs_assert(test_bit(COW_ZNODE, &znode->flags));
ubifs_assert(ubifs_zn_cow(znode));
__clear_bit(DIRTY_ZNODE, &znode->flags);
__clear_bit(COW_ZNODE, &znode->flags);
@ -639,7 +639,7 @@ static int get_znodes_to_commit(struct ubifs_info *c)
}
cnt += 1;
while (1) {
ubifs_assert(!test_bit(COW_ZNODE, &znode->flags));
ubifs_assert(!ubifs_zn_cow(znode));
__set_bit(COW_ZNODE, &znode->flags);
znode->alt = 0;
cnext = find_next_dirty(znode);
@ -888,7 +888,7 @@ static int write_index(struct ubifs_info *c)
cnext = znode->cnext;
ubifs_assert(ubifs_zn_dirty(znode));
ubifs_assert(test_bit(COW_ZNODE, &znode->flags));
ubifs_assert(ubifs_zn_cow(znode));
/*
* It is important that other threads should see %DIRTY_ZNODE
@ -983,7 +983,7 @@ static void free_obsolete_znodes(struct ubifs_info *c)
do {
znode = cnext;
cnext = znode->cnext;
if (test_bit(OBSOLETE_ZNODE, &znode->flags))
if (ubifs_zn_obsolete(znode))
kfree(znode);
else {
znode->cnext = NULL;