X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=mm%2Fshmem.c;h=5326876d814d2ab01c86db08b8b6e50de3fd2f2b;hb=f0be3d32b05d3fea2fcdbbb81a39dac2a7163169;hp=3372bc579e896f474ef24cffa929b69228ff9445;hpb=6c47d773e7d8f784996d9027f035379baa19ded7;p=~andy%2Flinux

diff --git a/mm/shmem.c b/mm/shmem.c
index 3372bc579e8..5326876d814 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -244,9 +244,8 @@ static void shmem_free_inode(struct super_block *sb)
 	}
 }
 
-/*
+/**
  * shmem_recalc_inode - recalculate the size of an inode
- *
  * @inode: inode to recalc
  *
  * We have to calculate the free blocks since the mm can drop
@@ -270,9 +269,8 @@ static void shmem_recalc_inode(struct inode *inode)
 	}
 }
 
-/*
+/**
  * shmem_swp_entry - find the swap vector position in the info structure
- *
  * @info:  info structure for the inode
  * @index: index of the page to find
  * @page:  optional page to add to the structure. Has to be preset to
@@ -374,13 +372,13 @@ static void shmem_swp_set(struct shmem_inode_info *info, swp_entry_t *entry, uns
 	}
 }
 
-/*
+/**
  * shmem_swp_alloc - get the position of the swap entry for the page.
- *                   If it does not exist allocate the entry.
- *
  * @info:	info structure for the inode
  * @index:	index of the page to find
  * @sgp:	check and recheck i_size? skip allocation?
+ *
+ * If the entry does not exist, allocate it.
  */
 static swp_entry_t *shmem_swp_alloc(struct shmem_inode_info *info, unsigned long index, enum sgp_type sgp)
 {
@@ -440,9 +438,8 @@ static swp_entry_t *shmem_swp_alloc(struct shmem_inode_info *info, unsigned long
 	return entry;
 }
 
-/*
+/**
  * shmem_free_swp - free some swap entries in a directory
- *
  * @dir:        pointer to the directory
  * @edir:       pointer after last entry of the directory
  * @punch_lock: pointer to spinlock when needed for the holepunch case
@@ -1082,9 +1079,11 @@ redirty:
 
 #ifdef CONFIG_NUMA
 #ifdef CONFIG_TMPFS
-static int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_nodes)
+static int shmem_parse_mpol(char *value, unsigned short *policy,
+			unsigned short *mode_flags, nodemask_t *policy_nodes)
 {
 	char *nodelist = strchr(value, ':');
+	char *flags = strchr(value, '=');
 	int err = 1;
 
 	if (nodelist) {
@@ -1095,6 +1094,8 @@ static int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_nodes)
 		if (!nodes_subset(*policy_nodes, node_states[N_HIGH_MEMORY]))
 			goto out;
 	}
+	if (flags)
+		*flags++ = '\0';
 	if (!strcmp(value, "default")) {
 		*policy = MPOL_DEFAULT;
 		/* Don't allow a nodelist */
@@ -1124,15 +1125,31 @@ static int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_nodes)
 			*policy_nodes = node_states[N_HIGH_MEMORY];
 		err = 0;
 	}
+
+	*mode_flags = 0;
+	if (flags) {
+		/*
+		 * Currently, we only support two mutually exclusive
+		 * mode flags.
+		 */
+		if (!strcmp(flags, "static"))
+			*mode_flags |= MPOL_F_STATIC_NODES;
+		else if (!strcmp(flags, "relative"))
+			*mode_flags |= MPOL_F_RELATIVE_NODES;
+		else
+			err = 1;	/* unrecognized flag */
+	}
 out:
 	/* Restore string for error message */
 	if (nodelist)
 		*--nodelist = ':';
+	if (flags)
+		*--flags = '=';
 	return err;
 }
 
-static void shmem_show_mpol(struct seq_file *seq, int policy,
-			    const nodemask_t policy_nodes)
+static void shmem_show_mpol(struct seq_file *seq, unsigned short policy,
+			unsigned short flags, const nodemask_t policy_nodes)
 {
 	char *policy_string;
 
@@ -1179,7 +1196,7 @@ static struct page *shmem_swapin(swp_entry_t entry, gfp_t gfp,
 	pvma.vm_ops = NULL;
 	pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, idx);
 	page = swapin_readahead(entry, gfp, &pvma, 0);
-	mpol_free(pvma.vm_policy);
+	mpol_put(pvma.vm_policy);
 	return page;
 }
 
@@ -1195,19 +1212,19 @@ static struct page *shmem_alloc_page(gfp_t gfp,
 	pvma.vm_ops = NULL;
 	pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, idx);
 	page = alloc_page_vma(gfp, &pvma, 0);
-	mpol_free(pvma.vm_policy);
+	mpol_put(pvma.vm_policy);
 	return page;
 }
 #else /* !CONFIG_NUMA */
 #ifdef CONFIG_TMPFS
-static inline int shmem_parse_mpol(char *value, int *policy,
-						nodemask_t *policy_nodes)
+static inline int shmem_parse_mpol(char *value, unsigned short *policy,
+			unsigned short *mode_flags, nodemask_t *policy_nodes)
 {
 	return 1;
 }
 
-static inline void shmem_show_mpol(struct seq_file *seq, int policy,
-			    const nodemask_t policy_nodes)
+static inline void shmem_show_mpol(struct seq_file *seq, unsigned short policy,
+			unsigned short flags, const nodemask_t policy_nodes)
 {
 }
 #endif /* CONFIG_TMPFS */
@@ -1580,7 +1597,7 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev)
 			inode->i_op = &shmem_inode_operations;
 			inode->i_fop = &shmem_file_operations;
 			mpol_shared_policy_init(&info->policy, sbinfo->policy,
-							&sbinfo->policy_nodes);
+					sbinfo->flags, &sbinfo->policy_nodes);
 			break;
 		case S_IFDIR:
 			inc_nlink(inode);
@@ -1594,7 +1611,7 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev)
 			 * Must not load anything in the rbtree,
 			 * mpol_free_shared_policy will not be called.
 			 */
-			mpol_shared_policy_init(&info->policy, MPOL_DEFAULT,
+			mpol_shared_policy_init(&info->policy, MPOL_DEFAULT, 0,
 						NULL);
 			break;
 		}
@@ -2022,7 +2039,7 @@ static const struct inode_operations shmem_symlink_inode_operations = {
 };
 
 #ifdef CONFIG_TMPFS_POSIX_ACL
-/**
+/*
  * Superblocks without xattr inode operations will get security.* xattr
  * support from the VFS "for free". As soon as we have any other xattrs
  * like ACLs, we also need to implement the security.* handlers at
@@ -2211,7 +2228,7 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
 				goto bad_val;
 		} else if (!strcmp(this_char,"mpol")) {
 			if (shmem_parse_mpol(value, &sbinfo->policy,
-					     &sbinfo->policy_nodes))
+				&sbinfo->flags, &sbinfo->policy_nodes))
 				goto bad_val;
 		} else {
 			printk(KERN_ERR "tmpfs: Bad mount option %s\n",
@@ -2263,6 +2280,7 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
 	sbinfo->max_inodes  = config.max_inodes;
 	sbinfo->free_inodes = config.max_inodes - inodes;
 	sbinfo->policy      = config.policy;
+	sbinfo->flags	    = config.flags;
 	sbinfo->policy_nodes = config.policy_nodes;
 out:
 	spin_unlock(&sbinfo->stat_lock);
@@ -2284,7 +2302,8 @@ static int shmem_show_options(struct seq_file *seq, struct vfsmount *vfs)
 		seq_printf(seq, ",uid=%u", sbinfo->uid);
 	if (sbinfo->gid != 0)
 		seq_printf(seq, ",gid=%u", sbinfo->gid);
-	shmem_show_mpol(seq, sbinfo->policy, sbinfo->policy_nodes);
+	shmem_show_mpol(seq, sbinfo->policy, sbinfo->flags,
+			sbinfo->policy_nodes);
 	return 0;
 }
 #endif /* CONFIG_TMPFS */
@@ -2315,6 +2334,7 @@ static int shmem_fill_super(struct super_block *sb,
 	sbinfo->uid = current->fsuid;
 	sbinfo->gid = current->fsgid;
 	sbinfo->policy = MPOL_DEFAULT;
+	sbinfo->flags = 0;
 	sbinfo->policy_nodes = node_states[N_HIGH_MEMORY];
 	sb->s_fs_info = sbinfo;
 
@@ -2561,12 +2581,11 @@ out4:
 }
 module_init(init_tmpfs)
 
-/*
+/**
  * shmem_file_setup - get an unlinked file living in tmpfs
- *
  * @name: name for dentry (to be seen in /proc/<pid>/maps
  * @size: size to be set for the file
- *
+ * @flags: vm_flags
  */
 struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags)
 {
@@ -2621,9 +2640,8 @@ put_memory:
 	return ERR_PTR(error);
 }
 
-/*
+/**
  * shmem_zero_setup - setup a shared anonymous mapping
- *
  * @vma: the vma to be mmapped is prepared by do_mmap_pgoff
  */
 int shmem_zero_setup(struct vm_area_struct *vma)