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[PATCH] fix reservation discarding in affs 

- remove affs_put_inode, so preallocations aren't discared unnecessarily
  often.
- remove affs_drop_inode, it's called with a spinlock held, so it can't
  use a mutex.
- make i_opencnt atomic
- avoid direct b_count manipulations
- a few allocation failure fixes, so that these are more gracefully
  handled now.
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Roman Zippel 2008-04-29 17:02:20 +02:00 committed by Al Viro
parent a15306365a
commit dca3c33652
5 changed files with 41 additions and 46 deletions
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4
fs/affs/affs.h
View File

@ -48,7 +48,7 @@ struct affs_ext_key {
* affs fs inode data in memory
*/
struct affs_inode_info {
u32 i_opencnt;
atomic_t i_opencnt;
struct semaphore i_link_lock; /* Protects internal inode access. */
struct semaphore i_ext_lock; /* Protects internal inode access. */
#define i_hash_lock i_ext_lock
@ -170,8 +170,6 @@ extern int affs_rename(struct inode *old_dir, struct dentry *old_dentry,
extern unsigned long affs_parent_ino(struct inode *dir);
extern struct inode *affs_new_inode(struct inode *dir);
extern int affs_notify_change(struct dentry *dentry, struct iattr *attr);
extern void affs_put_inode(struct inode *inode);
extern void affs_drop_inode(struct inode *inode);
extern void affs_delete_inode(struct inode *inode);
extern void affs_clear_inode(struct inode *inode);
extern struct inode *affs_iget(struct super_block *sb,

25
fs/affs/file.c
View File

@ -48,8 +48,9 @@ affs_file_open(struct inode *inode, struct file *filp)
{
if (atomic_read(&filp->f_count) != 1)
return 0;
pr_debug("AFFS: open(%d)\n", AFFS_I(inode)->i_opencnt);
AFFS_I(inode)->i_opencnt++;
pr_debug("AFFS: open(%lu,%d)\n",
inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
atomic_inc(&AFFS_I(inode)->i_opencnt);
return 0;
}
@ -58,10 +59,16 @@ affs_file_release(struct inode *inode, struct file *filp)
{
if (atomic_read(&filp->f_count) != 0)
return 0;
pr_debug("AFFS: release(%d)\n", AFFS_I(inode)->i_opencnt);
AFFS_I(inode)->i_opencnt--;
if (!AFFS_I(inode)->i_opencnt)
pr_debug("AFFS: release(%lu, %d)\n",
inode->i_ino, atomic_read(&AFFS_I(inode)->i_opencnt));
if (atomic_dec_and_test(&AFFS_I(inode)->i_opencnt)) {
mutex_lock(&inode->i_mutex);
if (inode->i_size != AFFS_I(inode)->mmu_private)
affs_truncate(inode);
affs_free_prealloc(inode);
mutex_unlock(&inode->i_mutex);
}
return 0;
}
@ -180,7 +187,7 @@ affs_get_extblock(struct inode *inode, u32 ext)
/* inline the simplest case: same extended block as last time */
struct buffer_head *bh = AFFS_I(inode)->i_ext_bh;
if (ext == AFFS_I(inode)->i_ext_last)
atomic_inc(&bh->b_count);
get_bh(bh);
else
/* we have to do more (not inlined) */
bh = affs_get_extblock_slow(inode, ext);
@ -306,7 +313,7 @@ store_ext:
affs_brelse(AFFS_I(inode)->i_ext_bh);
AFFS_I(inode)->i_ext_last = ext;
AFFS_I(inode)->i_ext_bh = bh;
atomic_inc(&bh->b_count);
get_bh(bh);
return bh;
@ -324,7 +331,6 @@ affs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_resul
pr_debug("AFFS: get_block(%u, %lu)\n", (u32)inode->i_ino, (unsigned long)block);
BUG_ON(block > (sector_t)0x7fffffffUL);
if (block >= AFFS_I(inode)->i_blkcnt) {
@ -827,6 +833,8 @@ affs_truncate(struct inode *inode)
res = mapping->a_ops->write_begin(NULL, mapping, size, 0, 0, &page, &fsdata);
if (!res)
res = mapping->a_ops->write_end(NULL, mapping, size, 0, 0, page, fsdata);
else
inode->i_size = AFFS_I(inode)->mmu_private;
mark_inode_dirty(inode);
return;
} else if (inode->i_size == AFFS_I(inode)->mmu_private)
@ -862,6 +870,7 @@ affs_truncate(struct inode *inode)
blk++;
} else
AFFS_HEAD(ext_bh)->first_data = 0;
AFFS_HEAD(ext_bh)->block_count = cpu_to_be32(i);
size = AFFS_SB(sb)->s_hashsize;
if (size > blkcnt - blk + i)
size = blkcnt - blk + i;

34
fs/affs/inode.c
View File

@ -58,7 +58,7 @@ struct inode *affs_iget(struct super_block *sb, unsigned long ino)
AFFS_I(inode)->i_extcnt = 1;
AFFS_I(inode)->i_ext_last = ~1;
AFFS_I(inode)->i_protect = prot;
AFFS_I(inode)->i_opencnt = 0;
atomic_set(&AFFS_I(inode)->i_opencnt, 0);
AFFS_I(inode)->i_blkcnt = 0;
AFFS_I(inode)->i_lc = NULL;
AFFS_I(inode)->i_lc_size = 0;
@ -108,8 +108,6 @@ struct inode *affs_iget(struct super_block *sb, unsigned long ino)
inode->i_mode |= S_IFDIR;
} else
inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
if (tail->link_chain)
inode->i_nlink = 2;
/* Maybe it should be controlled by mount parameter? */
//inode->i_mode |= S_ISVTX;
inode->i_op = &affs_dir_inode_operations;
@ -244,32 +242,13 @@ out:
return error;
}
void
affs_put_inode(struct inode *inode)
{
pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
affs_free_prealloc(inode);
}
void
affs_drop_inode(struct inode *inode)
{
mutex_lock(&inode->i_mutex);
if (inode->i_size != AFFS_I(inode)->mmu_private)
affs_truncate(inode);
mutex_unlock(&inode->i_mutex);
generic_drop_inode(inode);
}
void
affs_delete_inode(struct inode *inode)
{
pr_debug("AFFS: delete_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
truncate_inode_pages(&inode->i_data, 0);
inode->i_size = 0;
if (S_ISREG(inode->i_mode))
affs_truncate(inode);
affs_truncate(inode);
clear_inode(inode);
affs_free_block(inode->i_sb, inode->i_ino);
}
@ -277,9 +256,12 @@ affs_delete_inode(struct inode *inode)
void
affs_clear_inode(struct inode *inode)
{
unsigned long cache_page = (unsigned long) AFFS_I(inode)->i_lc;
unsigned long cache_page;
pr_debug("AFFS: clear_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
affs_free_prealloc(inode);
cache_page = (unsigned long)AFFS_I(inode)->i_lc;
if (cache_page) {
pr_debug("AFFS: freeing ext cache\n");
AFFS_I(inode)->i_lc = NULL;
@ -316,7 +298,7 @@ affs_new_inode(struct inode *dir)
inode->i_ino = block;
inode->i_nlink = 1;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
AFFS_I(inode)->i_opencnt = 0;
atomic_set(&AFFS_I(inode)->i_opencnt, 0);
AFFS_I(inode)->i_blkcnt = 0;
AFFS_I(inode)->i_lc = NULL;
AFFS_I(inode)->i_lc_size = 0;
@ -369,12 +351,12 @@ affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s3
switch (type) {
case ST_LINKFILE:
case ST_LINKDIR:
inode_bh = bh;
retval = -ENOSPC;
block = affs_alloc_block(dir, dir->i_ino);
if (!block)
goto err;
retval = -EIO;
inode_bh = bh;
bh = affs_getzeroblk(sb, block);
if (!bh)
goto err;

6
fs/affs/namei.c
View File

@ -234,7 +234,8 @@ affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
int
affs_unlink(struct inode *dir, struct dentry *dentry)
{
pr_debug("AFFS: unlink(dir=%d, \"%.*s\")\n", (u32)dir->i_ino,
pr_debug("AFFS: unlink(dir=%d, %lu \"%.*s\")\n", (u32)dir->i_ino,
dentry->d_inode->i_ino,
(int)dentry->d_name.len, dentry->d_name.name);
return affs_remove_header(dentry);
@ -302,7 +303,8 @@ affs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
int
affs_rmdir(struct inode *dir, struct dentry *dentry)
{
pr_debug("AFFS: rmdir(dir=%u, \"%.*s\")\n", (u32)dir->i_ino,
pr_debug("AFFS: rmdir(dir=%u, %lu \"%.*s\")\n", (u32)dir->i_ino,
dentry->d_inode->i_ino,
(int)dentry->d_name.len, dentry->d_name.name);
return affs_remove_header(dentry);

18
fs/affs/super.c
View File

@ -71,12 +71,18 @@ static struct kmem_cache * affs_inode_cachep;
static struct inode *affs_alloc_inode(struct super_block *sb)
{
struct affs_inode_info *ei;
ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
if (!ei)
struct affs_inode_info *i;
i = kmem_cache_alloc(affs_inode_cachep, GFP_KERNEL);
if (!i)
return NULL;
ei->vfs_inode.i_version = 1;
return &ei->vfs_inode;
i->vfs_inode.i_version = 1;
i->i_lc = NULL;
i->i_ext_bh = NULL;
i->i_pa_cnt = 0;
return &i->vfs_inode;
}
static void affs_destroy_inode(struct inode *inode)
@ -114,8 +120,6 @@ static const struct super_operations affs_sops = {
.alloc_inode = affs_alloc_inode,
.destroy_inode = affs_destroy_inode,
.write_inode = affs_write_inode,
.put_inode = affs_put_inode,
.drop_inode = affs_drop_inode,
.delete_inode = affs_delete_inode,
.clear_inode = affs_clear_inode,
.put_super = affs_put_super,