[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>

5 files changed, 41 insertions, 46 deletions

diff --git a/fs/affs/affs.h b/fs/affs/affs.h
index d5bd497ab9cb..223b1917093e 100644
--- a/fs/affs/affs.h
+++ b/fs/affs/affs.h
@@ -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,
diff --git a/fs/affs/file.c b/fs/affs/file.c
index 1a4f092f24ef..6eac7bdeec94 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -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;
diff --git a/fs/affs/inode.c b/fs/affs/inode.c
index 27fe6cbe43ae..a13b334a3910 100644
--- a/fs/affs/inode.c
+++ b/fs/affs/inode.c
@@ -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;
@@ -245,31 +243,12 @@ out:
 }
 
 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;
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index 2218f1ee71ce..cfcf1b6cf82b 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -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);
diff --git a/fs/affs/super.c b/fs/affs/super.c
index 01d25d532541..d214837d5e42 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -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,