提交 680d794b 编写于 作者: A akpm@linux-foundation.org 提交者: Linus Torvalds

mount options: fix tmpfs

Add .show_options super operation to tmpfs.
Signed-off-by: NHugh Dickins <hugh@veritas.com>
Signed-off-by: NMiklos Szeredi <mszeredi@suse.cz>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 90d09e14
...@@ -30,9 +30,12 @@ struct shmem_sb_info { ...@@ -30,9 +30,12 @@ struct shmem_sb_info {
unsigned long free_blocks; /* How many are left for allocation */ unsigned long free_blocks; /* How many are left for allocation */
unsigned long max_inodes; /* How many inodes are allowed */ unsigned long max_inodes; /* How many inodes are allowed */
unsigned long free_inodes; /* How many are left for allocation */ unsigned long free_inodes; /* How many are left for allocation */
spinlock_t stat_lock; /* Serialize shmem_sb_info changes */
uid_t uid; /* Mount uid for root directory */
gid_t gid; /* Mount gid for root directory */
mode_t mode; /* Mount mode for root directory */
int policy; /* Default NUMA memory alloc policy */ int policy; /* Default NUMA memory alloc policy */
nodemask_t policy_nodes; /* nodemask for preferred and bind */ nodemask_t policy_nodes; /* nodemask for preferred and bind */
spinlock_t stat_lock;
}; };
static inline struct shmem_inode_info *SHMEM_I(struct inode *inode) static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
......
...@@ -49,6 +49,7 @@ ...@@ -49,6 +49,7 @@
#include <linux/ctype.h> #include <linux/ctype.h>
#include <linux/migrate.h> #include <linux/migrate.h>
#include <linux/highmem.h> #include <linux/highmem.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/div64.h> #include <asm/div64.h>
...@@ -84,6 +85,16 @@ enum sgp_type { ...@@ -84,6 +85,16 @@ enum sgp_type {
SGP_WRITE, /* may exceed i_size, may allocate page */ SGP_WRITE, /* may exceed i_size, may allocate page */
}; };
static unsigned long shmem_default_max_blocks(void)
{
return totalram_pages / 2;
}
static unsigned long shmem_default_max_inodes(void)
{
return min(totalram_pages - totalhigh_pages, totalram_pages / 2);
}
static int shmem_getpage(struct inode *inode, unsigned long idx, static int shmem_getpage(struct inode *inode, unsigned long idx,
struct page **pagep, enum sgp_type sgp, int *type); struct page **pagep, enum sgp_type sgp, int *type);
...@@ -1068,7 +1079,8 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc) ...@@ -1068,7 +1079,8 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
} }
#ifdef CONFIG_NUMA #ifdef CONFIG_NUMA
static inline int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_nodes) #ifdef CONFIG_TMPFS
static int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_nodes)
{ {
char *nodelist = strchr(value, ':'); char *nodelist = strchr(value, ':');
int err = 1; int err = 1;
...@@ -1117,6 +1129,42 @@ static inline int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_ ...@@ -1117,6 +1129,42 @@ static inline int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_
return err; return err;
} }
static void shmem_show_mpol(struct seq_file *seq, int policy,
const nodemask_t policy_nodes)
{
char *policy_string;
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;
}
seq_printf(seq, ",mpol=%s", policy_string);
if (policy != MPOL_INTERLEAVE ||
!nodes_equal(policy_nodes, node_states[N_HIGH_MEMORY])) {
char buffer[64];
int len;
len = nodelist_scnprintf(buffer, sizeof(buffer), policy_nodes);
if (len < sizeof(buffer))
seq_printf(seq, ":%s", buffer);
else
seq_printf(seq, ":?");
}
}
#endif /* CONFIG_TMPFS */
static struct page *shmem_swapin(swp_entry_t entry, gfp_t gfp, static struct page *shmem_swapin(swp_entry_t entry, gfp_t gfp,
struct shmem_inode_info *info, unsigned long idx) struct shmem_inode_info *info, unsigned long idx)
{ {
...@@ -1148,13 +1196,20 @@ static struct page *shmem_alloc_page(gfp_t gfp, ...@@ -1148,13 +1196,20 @@ static struct page *shmem_alloc_page(gfp_t gfp,
mpol_free(pvma.vm_policy); mpol_free(pvma.vm_policy);
return page; return page;
} }
#else #else /* !CONFIG_NUMA */
#ifdef CONFIG_TMPFS
static inline int shmem_parse_mpol(char *value, int *policy, static inline int shmem_parse_mpol(char *value, int *policy,
nodemask_t *policy_nodes) nodemask_t *policy_nodes)
{ {
return 1; return 1;
} }
static inline void shmem_show_mpol(struct seq_file *seq, int policy,
const nodemask_t policy_nodes)
{
}
#endif /* CONFIG_TMPFS */
static inline struct page *shmem_swapin(swp_entry_t entry, gfp_t gfp, static inline struct page *shmem_swapin(swp_entry_t entry, gfp_t gfp,
struct shmem_inode_info *info, unsigned long idx) struct shmem_inode_info *info, unsigned long idx)
{ {
...@@ -1166,7 +1221,7 @@ static inline struct page *shmem_alloc_page(gfp_t gfp, ...@@ -1166,7 +1221,7 @@ static inline struct page *shmem_alloc_page(gfp_t gfp,
{ {
return alloc_page(gfp); return alloc_page(gfp);
} }
#endif #endif /* CONFIG_NUMA */
/* /*
* shmem_getpage - either get the page from swap or allocate a new one * shmem_getpage - either get the page from swap or allocate a new one
...@@ -2077,9 +2132,8 @@ static const struct export_operations shmem_export_ops = { ...@@ -2077,9 +2132,8 @@ static const struct export_operations shmem_export_ops = {
.fh_to_dentry = shmem_fh_to_dentry, .fh_to_dentry = shmem_fh_to_dentry,
}; };
static int shmem_parse_options(char *options, int *mode, uid_t *uid, static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
gid_t *gid, unsigned long *blocks, unsigned long *inodes, bool remount)
int *policy, nodemask_t *policy_nodes)
{ {
char *this_char, *value, *rest; char *this_char, *value, *rest;
...@@ -2122,35 +2176,37 @@ static int shmem_parse_options(char *options, int *mode, uid_t *uid, ...@@ -2122,35 +2176,37 @@ static int shmem_parse_options(char *options, int *mode, uid_t *uid,
} }
if (*rest) if (*rest)
goto bad_val; goto bad_val;
*blocks = DIV_ROUND_UP(size, PAGE_CACHE_SIZE); sbinfo->max_blocks =
DIV_ROUND_UP(size, PAGE_CACHE_SIZE);
} else if (!strcmp(this_char,"nr_blocks")) { } else if (!strcmp(this_char,"nr_blocks")) {
*blocks = memparse(value,&rest); sbinfo->max_blocks = memparse(value, &rest);
if (*rest) if (*rest)
goto bad_val; goto bad_val;
} else if (!strcmp(this_char,"nr_inodes")) { } else if (!strcmp(this_char,"nr_inodes")) {
*inodes = memparse(value,&rest); sbinfo->max_inodes = memparse(value, &rest);
if (*rest) if (*rest)
goto bad_val; goto bad_val;
} else if (!strcmp(this_char,"mode")) { } else if (!strcmp(this_char,"mode")) {
if (!mode) if (remount)
continue; continue;
*mode = simple_strtoul(value,&rest,8); sbinfo->mode = simple_strtoul(value, &rest, 8) & 07777;
if (*rest) if (*rest)
goto bad_val; goto bad_val;
} else if (!strcmp(this_char,"uid")) { } else if (!strcmp(this_char,"uid")) {
if (!uid) if (remount)
continue; continue;
*uid = simple_strtoul(value,&rest,0); sbinfo->uid = simple_strtoul(value, &rest, 0);
if (*rest) if (*rest)
goto bad_val; goto bad_val;
} else if (!strcmp(this_char,"gid")) { } else if (!strcmp(this_char,"gid")) {
if (!gid) if (remount)
continue; continue;
*gid = simple_strtoul(value,&rest,0); sbinfo->gid = simple_strtoul(value, &rest, 0);
if (*rest) if (*rest)
goto bad_val; goto bad_val;
} else if (!strcmp(this_char,"mpol")) { } else if (!strcmp(this_char,"mpol")) {
if (shmem_parse_mpol(value,policy,policy_nodes)) if (shmem_parse_mpol(value, &sbinfo->policy,
&sbinfo->policy_nodes))
goto bad_val; goto bad_val;
} else { } else {
printk(KERN_ERR "tmpfs: Bad mount option %s\n", printk(KERN_ERR "tmpfs: Bad mount option %s\n",
...@@ -2170,24 +2226,20 @@ static int shmem_parse_options(char *options, int *mode, uid_t *uid, ...@@ -2170,24 +2226,20 @@ static int shmem_parse_options(char *options, int *mode, uid_t *uid,
static int shmem_remount_fs(struct super_block *sb, int *flags, char *data) static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
{ {
struct shmem_sb_info *sbinfo = SHMEM_SB(sb); struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
unsigned long max_blocks = sbinfo->max_blocks; struct shmem_sb_info config = *sbinfo;
unsigned long max_inodes = sbinfo->max_inodes;
int policy = sbinfo->policy;
nodemask_t policy_nodes = sbinfo->policy_nodes;
unsigned long blocks; unsigned long blocks;
unsigned long inodes; unsigned long inodes;
int error = -EINVAL; int error = -EINVAL;
if (shmem_parse_options(data, NULL, NULL, NULL, &max_blocks, if (shmem_parse_options(data, &config, true))
&max_inodes, &policy, &policy_nodes))
return error; return error;
spin_lock(&sbinfo->stat_lock); spin_lock(&sbinfo->stat_lock);
blocks = sbinfo->max_blocks - sbinfo->free_blocks; blocks = sbinfo->max_blocks - sbinfo->free_blocks;
inodes = sbinfo->max_inodes - sbinfo->free_inodes; inodes = sbinfo->max_inodes - sbinfo->free_inodes;
if (max_blocks < blocks) if (config.max_blocks < blocks)
goto out; goto out;
if (max_inodes < inodes) if (config.max_inodes < inodes)
goto out; goto out;
/* /*
* Those tests also disallow limited->unlimited while any are in * Those tests also disallow limited->unlimited while any are in
...@@ -2195,23 +2247,42 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data) ...@@ -2195,23 +2247,42 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
* but we must separately disallow unlimited->limited, because * but we must separately disallow unlimited->limited, because
* in that case we have no record of how much is already in use. * in that case we have no record of how much is already in use.
*/ */
if (max_blocks && !sbinfo->max_blocks) if (config.max_blocks && !sbinfo->max_blocks)
goto out; goto out;
if (max_inodes && !sbinfo->max_inodes) if (config.max_inodes && !sbinfo->max_inodes)
goto out; goto out;
error = 0; error = 0;
sbinfo->max_blocks = max_blocks; sbinfo->max_blocks = config.max_blocks;
sbinfo->free_blocks = max_blocks - blocks; sbinfo->free_blocks = config.max_blocks - blocks;
sbinfo->max_inodes = max_inodes; sbinfo->max_inodes = config.max_inodes;
sbinfo->free_inodes = max_inodes - inodes; sbinfo->free_inodes = config.max_inodes - inodes;
sbinfo->policy = policy; sbinfo->policy = config.policy;
sbinfo->policy_nodes = policy_nodes; sbinfo->policy_nodes = config.policy_nodes;
out: out:
spin_unlock(&sbinfo->stat_lock); spin_unlock(&sbinfo->stat_lock);
return error; return error;
} }
#endif
static int shmem_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
struct shmem_sb_info *sbinfo = SHMEM_SB(vfs->mnt_sb);
if (sbinfo->max_blocks != shmem_default_max_blocks())
seq_printf(seq, ",size=%luk",
sbinfo->max_blocks << (PAGE_CACHE_SHIFT - 10));
if (sbinfo->max_inodes != shmem_default_max_inodes())
seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes);
if (sbinfo->mode != (S_IRWXUGO | S_ISVTX))
seq_printf(seq, ",mode=%03o", sbinfo->mode);
if (sbinfo->uid != 0)
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);
return 0;
}
#endif /* CONFIG_TMPFS */
static void shmem_put_super(struct super_block *sb) static void shmem_put_super(struct super_block *sb)
{ {
...@@ -2224,15 +2295,23 @@ static int shmem_fill_super(struct super_block *sb, ...@@ -2224,15 +2295,23 @@ static int shmem_fill_super(struct super_block *sb,
{ {
struct inode *inode; struct inode *inode;
struct dentry *root; struct dentry *root;
int mode = S_IRWXUGO | S_ISVTX;
uid_t uid = current->fsuid;
gid_t gid = current->fsgid;
int err = -ENOMEM;
struct shmem_sb_info *sbinfo; struct shmem_sb_info *sbinfo;
unsigned long blocks = 0; int err = -ENOMEM;
unsigned long inodes = 0;
int policy = MPOL_DEFAULT; /* Round up to L1_CACHE_BYTES to resist false sharing */
nodemask_t policy_nodes = node_states[N_HIGH_MEMORY]; sbinfo = kmalloc(max((int)sizeof(struct shmem_sb_info),
L1_CACHE_BYTES), GFP_KERNEL);
if (!sbinfo)
return -ENOMEM;
sbinfo->max_blocks = 0;
sbinfo->max_inodes = 0;
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];
sb->s_fs_info = sbinfo;
#ifdef CONFIG_TMPFS #ifdef CONFIG_TMPFS
/* /*
...@@ -2241,34 +2320,22 @@ static int shmem_fill_super(struct super_block *sb, ...@@ -2241,34 +2320,22 @@ static int shmem_fill_super(struct super_block *sb,
* but the internal instance is left unlimited. * but the internal instance is left unlimited.
*/ */
if (!(sb->s_flags & MS_NOUSER)) { if (!(sb->s_flags & MS_NOUSER)) {
blocks = totalram_pages / 2; sbinfo->max_blocks = shmem_default_max_blocks();
inodes = totalram_pages - totalhigh_pages; sbinfo->max_inodes = shmem_default_max_inodes();
if (inodes > blocks) if (shmem_parse_options(data, sbinfo, false)) {
inodes = blocks; err = -EINVAL;
if (shmem_parse_options(data, &mode, &uid, &gid, &blocks, goto failed;
&inodes, &policy, &policy_nodes)) }
return -EINVAL;
} }
sb->s_export_op = &shmem_export_ops; sb->s_export_op = &shmem_export_ops;
#else #else
sb->s_flags |= MS_NOUSER; sb->s_flags |= MS_NOUSER;
#endif #endif
/* Round up to L1_CACHE_BYTES to resist false sharing */
sbinfo = kmalloc(max((int)sizeof(struct shmem_sb_info),
L1_CACHE_BYTES), GFP_KERNEL);
if (!sbinfo)
return -ENOMEM;
spin_lock_init(&sbinfo->stat_lock); spin_lock_init(&sbinfo->stat_lock);
sbinfo->max_blocks = blocks; sbinfo->free_blocks = sbinfo->max_blocks;
sbinfo->free_blocks = blocks; sbinfo->free_inodes = sbinfo->max_inodes;
sbinfo->max_inodes = inodes;
sbinfo->free_inodes = inodes;
sbinfo->policy = policy;
sbinfo->policy_nodes = policy_nodes;
sb->s_fs_info = sbinfo;
sb->s_maxbytes = SHMEM_MAX_BYTES; sb->s_maxbytes = SHMEM_MAX_BYTES;
sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
...@@ -2280,11 +2347,11 @@ static int shmem_fill_super(struct super_block *sb, ...@@ -2280,11 +2347,11 @@ static int shmem_fill_super(struct super_block *sb,
sb->s_flags |= MS_POSIXACL; sb->s_flags |= MS_POSIXACL;
#endif #endif
inode = shmem_get_inode(sb, S_IFDIR | mode, 0); inode = shmem_get_inode(sb, S_IFDIR | sbinfo->mode, 0);
if (!inode) if (!inode)
goto failed; goto failed;
inode->i_uid = uid; inode->i_uid = sbinfo->uid;
inode->i_gid = gid; inode->i_gid = sbinfo->gid;
root = d_alloc_root(inode); root = d_alloc_root(inode);
if (!root) if (!root)
goto failed_iput; goto failed_iput;
...@@ -2420,6 +2487,7 @@ static const struct super_operations shmem_ops = { ...@@ -2420,6 +2487,7 @@ static const struct super_operations shmem_ops = {
#ifdef CONFIG_TMPFS #ifdef CONFIG_TMPFS
.statfs = shmem_statfs, .statfs = shmem_statfs,
.remount_fs = shmem_remount_fs, .remount_fs = shmem_remount_fs,
.show_options = shmem_show_options,
#endif #endif
.delete_inode = shmem_delete_inode, .delete_inode = shmem_delete_inode,
.drop_inode = generic_delete_inode, .drop_inode = generic_delete_inode,
......
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