#include <linux/lustre_fsfilt.h>
#include <linux/lustre_smfs.h>
#include "smfs_internal.h"
-static void smfs_init_cache_inode (struct inode *inode, void *opaque)
+
+static void smfs_init_inode_info(struct inode *inode, void *opaque)
{
- struct smfs_inode_info *sm_info = (struct smfs_inode_info *)opaque;
- struct inode *cache_inode = NULL;
-
- cache_inode = iget(S2CSB(inode->i_sb), inode->i_ino);
+ if (!I2SMI(inode)) {
+ struct inode *cache_inode = NULL;
+ struct smfs_iget_args *sargs;
+ unsigned long ino;
+
+ sargs = (struct smfs_iget_args *)opaque;
+
+ /* getting backing fs inode. */
+ ino = sargs ? sargs->s_ino : inode->i_ino;
+ cache_inode = iget(S2CSB(inode->i_sb), ino);
+
+ OBD_ALLOC(inode->u.generic_ip,
+ sizeof(struct smfs_inode_info));
- if (sm_info)
- memcpy(I2SMI(inode), sm_info, sizeof(struct smfs_inode_info));
+ LASSERT(inode->u.generic_ip);
+ I2CI(inode) = cache_inode;
- I2CI(inode) = cache_inode;
- post_smfs_inode(inode, cache_inode);
- sm_set_inode_ops(cache_inode, inode);
-#if CONFIG_SNAPFS
- if (sm_info) {
- smfs_init_snap_inode_info(inode, &sm_info->sm_sninfo);
+ CDEBUG(D_INODE, "cache_inode i_count ino %lu i_count %d\n",
+ cache_inode->i_ino, atomic_read(&cache_inode->i_count));
+
+ post_smfs_inode(inode, cache_inode);
+ sm_set_inode_ops(cache_inode, inode);
+
+ if (sargs) {
+ struct inode *dir = sargs->s_inode;
+ if (dir)
+ I2SMI(inode)->smi_flags = I2SMI(dir)->smi_flags;
+ }
+ }
+}
+
+static void smfs_clear_inode_info(struct inode *inode)
+{
+ if (I2SMI(inode)) {
+ struct inode *cache_inode = I2CI(inode);
+
+ LASSERTF(((atomic_read(&cache_inode->i_count) == 1) ||
+ cache_inode == cache_inode->i_sb->s_root->d_inode),
+ "inode %p cache inode %p %lu i_count %d != 0 \n",
+ inode, cache_inode, cache_inode->i_ino,
+ atomic_read(&cache_inode->i_count));
+
+ if (cache_inode != cache_inode->i_sb->s_root->d_inode)
+ iput(cache_inode);
+
+ OBD_FREE(inode->u.generic_ip,
+ sizeof(struct smfs_inode_info));
+ inode->u.generic_ip = NULL;
}
-#endif
}
static void smfs_read_inode2(struct inode *inode, void *opaque)
{
ENTRY;
- if (!inode)
- return;
+ if (!inode) {
+ EXIT;
+ return;
+ }
+
CDEBUG(D_INODE, "read_inode ino %lu\n", inode->i_ino);
- smfs_init_cache_inode(inode, opaque);
+ smfs_init_inode_info(inode, opaque);
CDEBUG(D_INODE, "read_inode ino %lu icount %d \n",
inode->i_ino, atomic_read(&inode->i_count));
EXIT;
- return;
}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
static int smfs_test_inode(struct inode *inode, unsigned long ino,
- void *opaque)
+ void *opaque)
#else
static int smfs_test_inode(struct inode *inode, void *opaque)
#endif
{
- struct snap_inode_info *sn_info = &I2SMI(inode)->sm_sninfo;
- struct snap_inode_info *test_info = (struct snap_inode_info *)opaque;
-
- if (!sn_info || !test_info)
- return 0;
- if (sn_info->sn_index != test_info->sn_index)
- return 0;
- if (sn_info->sn_gen != test_info->sn_gen)
+ struct smfs_iget_args *sargs = (struct smfs_iget_args*)opaque;
+
+ LASSERT(sargs);
+
+ if (!sargs)
+ return 1;
+
+ if (inode->i_ino != sargs->s_ino)
return 0;
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
- smfs_init_cache_inode(inode, opaque);
+
+#ifdef CONFIG_SNAPFS
+ if (SMFS_DO_COW(S2SMI(inode->i_sb)) &&
+ !smfs_snap_test_inode(inode, opaque))
+ return 0;
#endif
+ if (I2SMI(inode)) {
+ struct inode *cache_inode = I2CI(inode);
+
+ /* this is needed to make symatry between smfs_put_inode(). */
+ LASSERT(cache_inode != NULL);
+ igrab(cache_inode);
+
+ LASSERTF(cache_inode->i_ino == inode->i_ino,
+ "inode ino %lu != cache ino %lu",
+ cache_inode->i_ino, inode->i_ino);
+ } else {
+ smfs_init_inode_info(inode, opaque);
+ }
+
return 1;
}
}
struct inode *smfs_iget(struct super_block *sb, ino_t hash,
- struct smfs_inode_info *si_info)
+ struct smfs_iget_args *sargs)
{
struct inode *inode;
-
LASSERT(hash != 0);
- inode = iget5_locked(sb, hash, smfs_test_inode, smfs_set_inode,
- si_info);
+ inode = iget5_locked(sb, hash, smfs_test_inode,
+ smfs_set_inode, sargs);
if (inode) {
if (inode->i_state & I_NEW)
unlock_new_inode(inode);
- CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p)\n", inode->i_ino,
- inode->i_generation, inode);
+ CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p) index %d "
+ "ino %d\n", inode->i_ino, inode->i_generation,
+ inode, sargs->s_index, sargs->s_ino);
+ inode->i_ino = hash;
}
return inode;
}
#else
struct inode *smfs_iget(struct super_block *sb, ino_t hash,
- struct smfs_inode_info *si_info)
+ struct smfs_iget_args *sargs)
{
struct inode *inode;
LASSERT(hash != 0);
- inode = iget4(sb, hash, smfs_test_inode, si_info);
-
- if (inode)
+ inode = iget4(sb, hash, smfs_test_inode, sargs);
+ if (inode) {
+ struct inode *cache_inode = I2CI(inode);
+ LASSERTF((inode->i_ino == cache_inode->i_ino),
+ "inode %p ino %lu != cache inode %p ino %lu",
+ inode, inode->i_ino, cache_inode, cache_inode->i_ino);
CDEBUG(D_VFSTRACE, "inode: %lu/%u(%p)\n", inode->i_ino,
inode->i_generation, inode);
+ }
return inode;
}
#endif
-struct inode *smfs_get_inode (struct super_block *sb, ino_t hash,
- struct inode *dir, int index)
+
+struct inode *smfs_get_inode(struct super_block *sb, ino_t hash,
+ struct inode *dir, int index)
{
- struct smfs_inode_info sm_info;
- struct inode *inode = NULL;
+ struct smfs_iget_args sargs;
+ struct inode *inode;
ENTRY;
-
- sm_info.smi_flags = I2SMI(dir)->smi_flags;
- sm_info.sm_sninfo.sn_flags = I2SMI(dir)->sm_sninfo.sn_flags;
- sm_info.sm_sninfo.sn_index = index;
- sm_info.sm_sninfo.sn_gen = I2SMI(dir)->sm_sninfo.sn_gen;
- inode = smfs_iget(sb, hash, &sm_info);
+
+ sargs.s_ino = hash;
+ sargs.s_inode = dir;
+ sargs.s_index = index;
+ inode = smfs_iget(sb, hash, &sargs);
RETURN(inode);
-}
-EXPORT_SYMBOL(smfs_get_inode);
+}
+
static void smfs_delete_inode(struct inode *inode)
{
- struct inode *cache_inode;
-
ENTRY;
- cache_inode = I2CI(inode);
-
- if (!cache_inode || !S2CSB(inode->i_sb))
- return;
-
- /* FIXME-WANGDI: because i_count of cache_inode may not be 0 or 1 in
- * before smfs_delete inode, So we need to dec it to 1 before we call
- * delete_inode of the bellow cache filesystem Check again latter. */
-
- if (atomic_read(&cache_inode->i_count) < 1)
- BUG();
-
- while (atomic_read(&cache_inode->i_count) != 1)
- atomic_dec(&cache_inode->i_count);
-
- pre_smfs_inode(inode, cache_inode);
-
- if (atomic_read(&cache_inode->i_count) < 1)
- LBUG();
-
- while (atomic_read(&cache_inode->i_count) != 1) {
- atomic_dec(&cache_inode->i_count);
- }
-
- pre_smfs_inode(inode, cache_inode);
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
- list_del(&cache_inode->i_hash);
- INIT_LIST_HEAD(&cache_inode->i_hash);
-#else
- hlist_del_init(&cache_inode->i_hash);
-#endif
-
- list_del(&cache_inode->i_list);
- INIT_LIST_HEAD(&cache_inode->i_list);
-
- if (cache_inode->i_data.nrpages)
- truncate_inode_pages(&cache_inode->i_data, 0);
-
- if (S2CSB(inode->i_sb)->s_op->delete_inode)
- S2CSB(inode->i_sb)->s_op->delete_inode(cache_inode);
-
- post_smfs_inode(inode, cache_inode);
-
- I2CI(inode) = NULL;
- return;
+ clear_inode(inode);
+ EXIT;
}
static void smfs_write_inode(struct inode *inode, int wait)
{
struct inode *cache_inode;
-
ENTRY;
+
cache_inode = I2CI(inode);
+ LASSERT(cache_inode != NULL);
- if (!cache_inode) {
- CWARN("cache inode null\n");
- return;
- }
pre_smfs_inode(inode, cache_inode);
if (S2CSB(inode->i_sb)->s_op->write_inode)
S2CSB(inode->i_sb)->s_op->write_inode(cache_inode, wait);
static void smfs_dirty_inode(struct inode *inode)
{
struct inode *cache_inode;
-
ENTRY;
- cache_inode = I2CI(inode);
- if (!cache_inode || !S2CSB(inode->i_sb))
+ cache_inode = I2CI(inode);
+ if (!cache_inode || !S2CSB(inode->i_sb)) {
+ EXIT;
return;
+ }
pre_smfs_inode(inode, cache_inode);
if (S2CSB(inode->i_sb)->s_op->dirty_inode)
static void smfs_put_inode(struct inode *inode)
{
struct inode *cache_inode;
-
ENTRY;
+
cache_inode = I2CI(inode);
+ LASSERT(cache_inode != NULL);
- if (!cache_inode) {
- CWARN("cache inode null\n");
- return;
- }
-
- if (atomic_read(&cache_inode->i_count) > 1 &&
- cache_inode != cache_inode->i_sb->s_root->d_inode)
+ if (atomic_read(&cache_inode->i_count) > 1)
iput(cache_inode);
-
- if (S2CSB(inode->i_sb)->s_op->put_inode)
- S2CSB(inode->i_sb)->s_op->put_inode(cache_inode);
+
+ /*
+ * check if we have to release backend inode. As iput() calls fs
+ * specific ->put_inode() first and than decrements inode rerfcount, we
+ * should check here ->i_count for 1, not for 0.
+
+ * In principle we could rely on ->clear_inode(), but it will be called
+ * later, and thus we will have iputing of @inode and @cache_inode in
+ * different control paths, this is why we do it here. --umka
+ */
+ if (atomic_read(&inode->i_count) == 1 &&
+ cache_inode->i_sb->s_root->d_inode != cache_inode)
+ smfs_clear_inode_info(inode);
EXIT;
}
-static void smfs_write_super(struct super_block *sb)
+static void smfs_clear_inode(struct inode *inode)
{
ENTRY;
-
- if (!S2CSB(sb))
- return;
-
- if (S2CSB(sb)->s_op->write_super)
- S2CSB(sb)->s_op->write_super(S2CSB(sb));
- duplicate_sb(sb, S2CSB(sb));
+ smfs_clear_inode_info(inode);
EXIT;
- return;
}
-static void smfs_clear_inode(struct inode *inode)
+static void smfs_write_super(struct super_block *sb)
{
- struct inode *cache_inode;
-
ENTRY;
- if (!inode) return;
-
- cache_inode = I2CI(inode);
-
- if (cache_inode != cache_inode->i_sb->s_root->d_inode) {
- iput(cache_inode);
- SMFS_CLEAN_INODE_REC(inode);
- I2CI(inode) = NULL;
+ if (!S2CSB(sb)) {
+ EXIT;
+ return;
}
+
+ if (S2CSB(sb)->s_op->write_super)
+ S2CSB(sb)->s_op->write_super(S2CSB(sb));
+ duplicate_sb(sb, S2CSB(sb));
EXIT;
- return;
}
static void smfs_write_super_lockfs(struct super_block *sb)
ENTRY;
cache_sb = S2CSB(sb);
- if (!cache_sb)
+ if (!cache_sb) {
+ EXIT;
return;
+ }
if (cache_sb->s_op->write_super_lockfs)
cache_sb->s_op->write_super_lockfs(cache_sb);
ENTRY;
cache_sb = S2CSB(sb);
- if (!cache_sb)
+ if (!cache_sb) {
+ EXIT;
return;
+ }
if (cache_sb->s_op->unlockfs)
cache_sb->s_op->unlockfs(cache_sb);
rc = cache_sb->s_op->statfs(cache_sb, buf);
duplicate_sb(sb, cache_sb);
-
RETURN(rc);
}
static int smfs_remount(struct super_block *sb, int *flags, char *data)
duplicate_sb(sb, cache_sb);
RETURN(rc);
}
+
struct super_operations smfs_super_ops = {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
.read_inode2 = smfs_read_inode2,
git://git.whamcloud.com / fs / lustre-release.git / blobdiff