static struct backing_dev_info shmem_backing_dev_info __read_mostly = {
.ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
.unplug_io_fn = default_unplug_io_fn,
};
}
}
-/*
+/**
* 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
}
}
-/*
+/**
* 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
}
}
-/*
+/**
* 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)
{
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
#ifdef CONFIG_NUMA
#ifdef CONFIG_TMPFS
-static int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_nodes)
-{
- char *nodelist = strchr(value, ':');
- int err = 1;
-
- if (nodelist) {
- /* NUL-terminate policy string */
- *nodelist++ = '\0';
- if (nodelist_parse(nodelist, *policy_nodes))
- goto out;
- if (!nodes_subset(*policy_nodes, node_states[N_HIGH_MEMORY]))
- goto out;
- }
- if (!strcmp(value, "default")) {
- *policy = MPOL_DEFAULT;
- /* Don't allow a nodelist */
- if (!nodelist)
- err = 0;
- } else if (!strcmp(value, "prefer")) {
- *policy = MPOL_PREFERRED;
- /* Insist on a nodelist of one node only */
- if (nodelist) {
- char *rest = nodelist;
- while (isdigit(*rest))
- rest++;
- if (!*rest)
- err = 0;
- }
- } else if (!strcmp(value, "bind")) {
- *policy = MPOL_BIND;
- /* Insist on a nodelist */
- if (nodelist)
- err = 0;
- } else if (!strcmp(value, "interleave")) {
- *policy = MPOL_INTERLEAVE;
- /*
- * Default to online nodes with memory if no nodelist
- */
- if (!nodelist)
- *policy_nodes = node_states[N_HIGH_MEMORY];
- err = 0;
- }
-out:
- /* Restore string for error message */
- if (nodelist)
- *--nodelist = ':';
- 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, struct mempolicy *mpol)
{
- char *policy_string;
+ char buffer[64];
- switch (policy) {
- case MPOL_PREFERRED:
- policy_string = "prefer";
- break;
- case MPOL_BIND:
- policy_string = "bind";
- break;
- case MPOL_INTERLEAVE:
- policy_string = "interleave";
- break;
- default:
- /* MPOL_DEFAULT */
- return;
- }
+ if (!mpol || mpol->mode == MPOL_DEFAULT)
+ return; /* show nothing */
- seq_printf(seq, ",mpol=%s", policy_string);
+ mpol_to_str(buffer, sizeof(buffer), mpol, 1);
- if (policy != MPOL_INTERLEAVE ||
- !nodes_equal(policy_nodes, node_states[N_HIGH_MEMORY])) {
- char buffer[64];
- int len;
+ seq_printf(seq, ",mpol=%s", buffer);
+}
- len = nodelist_scnprintf(buffer, sizeof(buffer), policy_nodes);
- if (len < sizeof(buffer))
- seq_printf(seq, ":%s", buffer);
- else
- seq_printf(seq, ":?");
+static struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo)
+{
+ struct mempolicy *mpol = NULL;
+ if (sbinfo->mpol) {
+ spin_lock(&sbinfo->stat_lock); /* prevent replace/use races */
+ mpol = sbinfo->mpol;
+ mpol_get(mpol);
+ spin_unlock(&sbinfo->stat_lock);
}
+ return mpol;
}
#endif /* CONFIG_TMPFS */
static struct page *shmem_swapin(swp_entry_t entry, gfp_t gfp,
struct shmem_inode_info *info, unsigned long idx)
{
+ struct mempolicy mpol, *spol;
struct vm_area_struct pvma;
struct page *page;
+ spol = mpol_cond_copy(&mpol,
+ mpol_shared_policy_lookup(&info->policy, idx));
+
/* Create a pseudo vma that just contains the policy */
pvma.vm_start = 0;
pvma.vm_pgoff = idx;
pvma.vm_ops = NULL;
- pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, idx);
+ pvma.vm_policy = spol;
page = swapin_readahead(entry, gfp, &pvma, 0);
- mpol_free(pvma.vm_policy);
return page;
}
struct shmem_inode_info *info, unsigned long idx)
{
struct vm_area_struct pvma;
- struct page *page;
/* Create a pseudo vma that just contains the policy */
pvma.vm_start = 0;
pvma.vm_pgoff = idx;
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);
- return page;
+
+ /*
+ * alloc_page_vma() will drop the shared policy reference
+ */
+ return alloc_page_vma(gfp, &pvma, 0);
}
#else /* !CONFIG_NUMA */
#ifdef CONFIG_TMPFS
-static inline int shmem_parse_mpol(char *value, int *policy,
- 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, struct mempolicy *p)
{
}
#endif /* CONFIG_TMPFS */
}
#endif /* CONFIG_NUMA */
+#if !defined(CONFIG_NUMA) || !defined(CONFIG_TMPFS)
+static inline struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo)
+{
+ return NULL;
+}
+#endif
+
/*
* shmem_getpage - either get the page from swap or allocate a new one
*
case S_IFREG:
inode->i_op = &shmem_inode_operations;
inode->i_fop = &shmem_file_operations;
- mpol_shared_policy_init(&info->policy, sbinfo->policy,
- &sbinfo->policy_nodes);
+ mpol_shared_policy_init(&info->policy,
+ shmem_get_sbmpol(sbinfo));
break;
case S_IFDIR:
inc_nlink(inode);
* Must not load anything in the rbtree,
* mpol_free_shared_policy will not be called.
*/
- mpol_shared_policy_init(&info->policy, MPOL_DEFAULT,
- NULL);
+ mpol_shared_policy_init(&info->policy, NULL);
break;
}
} else
};
#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
if (*rest)
goto bad_val;
} else if (!strcmp(this_char,"mpol")) {
- if (shmem_parse_mpol(value, &sbinfo->policy,
- &sbinfo->policy_nodes))
+ if (mpol_parse_str(value, &sbinfo->mpol, 1))
goto bad_val;
} else {
printk(KERN_ERR "tmpfs: Bad mount option %s\n",
sbinfo->free_blocks = config.max_blocks - blocks;
sbinfo->max_inodes = config.max_inodes;
sbinfo->free_inodes = config.max_inodes - inodes;
- sbinfo->policy = config.policy;
- sbinfo->policy_nodes = config.policy_nodes;
+
+ mpol_put(sbinfo->mpol);
+ sbinfo->mpol = config.mpol; /* transfers initial ref */
out:
spin_unlock(&sbinfo->stat_lock);
return error;
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->mpol);
return 0;
}
#endif /* CONFIG_TMPFS */
sbinfo->mode = S_IRWXUGO | S_ISVTX;
sbinfo->uid = current->fsuid;
sbinfo->gid = current->fsgid;
- sbinfo->policy = MPOL_DEFAULT;
- sbinfo->policy_nodes = node_states[N_HIGH_MEMORY];
+ sbinfo->mpol = NULL;
sb->s_fs_info = sbinfo;
#ifdef CONFIG_TMPFS
}
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)
{
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)
git.openpandora.org / pandora-kernel.git / blobdiff