X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;ds=sidebyside;f=mm%2Fshmem.c;h=c066617be7ed36829e99db2a735ec01268f38f05;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=e8dc5af587e20858746c3cbcc948c69a558e654c;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git diff --git a/mm/shmem.c b/mm/shmem.c index e8dc5af58..c066617be 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -6,8 +6,8 @@ * 2000-2001 Christoph Rohland * 2000-2001 SAP AG * 2002 Red Hat Inc. - * Copyright (C) 2002-2004 Hugh Dickins. - * Copyright (C) 2002-2004 VERITAS Software Corporation. + * Copyright (C) 2002-2005 Hugh Dickins. + * Copyright (C) 2002-2005 VERITAS Software Corporation. * Copyright (C) 2004 Andi Kleen, SuSE Labs * * Extended attribute support for tmpfs: @@ -45,7 +45,9 @@ #include #include #include -#include +#include +#include + #include #include #include @@ -71,9 +73,6 @@ /* Pretend that each entry is of this size in directory's i_size */ #define BOGO_DIRENT_SIZE 20 -/* Keep swapped page count in private field of indirect struct page */ -#define nr_swapped private - /* Flag allocation requirements to shmem_getpage and shmem_swp_alloc */ enum sgp_type { SGP_QUICK, /* don't try more than file page cache lookup */ @@ -85,7 +84,7 @@ enum sgp_type { static int shmem_getpage(struct inode *inode, unsigned long idx, struct page **pagep, enum sgp_type sgp, int *type); -static inline struct page *shmem_dir_alloc(unsigned int gfp_mask) +static inline struct page *shmem_dir_alloc(gfp_t gfp_mask) { /* * The above definition of ENTRIES_PER_PAGE, and the use of @@ -178,10 +177,9 @@ static struct address_space_operations shmem_aops; static struct file_operations shmem_file_operations; static struct inode_operations shmem_inode_operations; static struct inode_operations shmem_dir_inode_operations; -static struct inode_operations shmem_special_inode_operations; static struct vm_operations_struct shmem_vm_ops; -static struct backing_dev_info shmem_backing_dev_info = { +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, .unplug_io_fn = default_unplug_io_fn, @@ -193,7 +191,7 @@ static DEFINE_SPINLOCK(shmem_swaplist_lock); static void shmem_free_blocks(struct inode *inode, long pages) { struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); - if (sbinfo) { + if (sbinfo->max_blocks) { spin_lock(&sbinfo->stat_lock); sbinfo->free_blocks += pages; inode->i_blocks -= pages*BLOCKS_PER_PAGE; @@ -325,8 +323,10 @@ static void shmem_swp_set(struct shmem_inode_info *info, swp_entry_t *entry, uns entry->val = value; info->swapped += incdec; - if ((unsigned long)(entry - info->i_direct) >= SHMEM_NR_DIRECT) - kmap_atomic_to_page(entry)->nr_swapped += incdec; + if ((unsigned long)(entry - info->i_direct) >= SHMEM_NR_DIRECT) { + struct page *page = kmap_atomic_to_page(entry); + set_page_private(page, page_private(page) + incdec); + } } /* @@ -356,7 +356,7 @@ static swp_entry_t *shmem_swp_alloc(struct shmem_inode_info *info, unsigned long * page (and perhaps indirect index pages) yet to allocate: * a waste to allocate index if we cannot allocate data. */ - if (sbinfo) { + if (sbinfo->max_blocks) { spin_lock(&sbinfo->stat_lock); if (sbinfo->free_blocks <= 1) { spin_unlock(&sbinfo->stat_lock); @@ -369,9 +369,8 @@ static swp_entry_t *shmem_swp_alloc(struct shmem_inode_info *info, unsigned long spin_unlock(&info->lock); page = shmem_dir_alloc(mapping_gfp_mask(inode->i_mapping) | __GFP_ZERO); - if (page) { - page->nr_swapped = 0; - } + if (page) + set_page_private(page, 0); spin_lock(&info->lock); if (!page) { @@ -460,7 +459,7 @@ static void shmem_free_pages(struct list_head *next) } while (next); } -static void shmem_truncate(struct inode *inode) +static void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end) { struct shmem_inode_info *info = SHMEM_I(inode); unsigned long idx; @@ -478,18 +477,27 @@ static void shmem_truncate(struct inode *inode) long nr_swaps_freed = 0; int offset; int freed; + int punch_hole = 0; inode->i_ctime = inode->i_mtime = CURRENT_TIME; - idx = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; + idx = (start + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; if (idx >= info->next_index) return; spin_lock(&info->lock); info->flags |= SHMEM_TRUNCATE; - limit = info->next_index; - info->next_index = idx; + if (likely(end == (loff_t) -1)) { + limit = info->next_index; + info->next_index = idx; + } else { + limit = (end + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; + if (limit > info->next_index) + limit = info->next_index; + punch_hole = 1; + } + topdir = info->i_indirect; - if (topdir && idx <= SHMEM_NR_DIRECT) { + if (topdir && idx <= SHMEM_NR_DIRECT && !punch_hole) { info->i_indirect = NULL; nr_pages_to_free++; list_add(&topdir->lru, &pages_to_free); @@ -562,7 +570,7 @@ static void shmem_truncate(struct inode *inode) diroff = 0; } subdir = dir[diroff]; - if (subdir && subdir->nr_swapped) { + if (subdir && page_private(subdir)) { size = limit - idx; if (size > ENTRIES_PER_PAGE) size = ENTRIES_PER_PAGE; @@ -573,14 +581,15 @@ static void shmem_truncate(struct inode *inode) nr_swaps_freed += freed; if (offset) spin_lock(&info->lock); - subdir->nr_swapped -= freed; + set_page_private(subdir, page_private(subdir) - freed); if (offset) spin_unlock(&info->lock); - BUG_ON(subdir->nr_swapped > offset); + if (!punch_hole) + BUG_ON(page_private(subdir) > offset); } if (offset) offset = 0; - else if (subdir) { + else if (subdir && !page_private(subdir)) { dir[diroff] = NULL; nr_pages_to_free++; list_add(&subdir->lru, &pages_to_free); @@ -597,7 +606,7 @@ done2: * Also, though shmem_getpage checks i_size before adding to * cache, no recheck after: so fix the narrow window there too. */ - truncate_inode_pages(inode->i_mapping, inode->i_size); + truncate_inode_pages_range(inode->i_mapping, start, end); } spin_lock(&info->lock); @@ -617,6 +626,11 @@ done2: } } +static void shmem_truncate(struct inode *inode) +{ + shmem_truncate_range(inode, inode->i_size, (loff_t)-1); +} + static int shmem_notify_change(struct dentry *dentry, struct iattr *attr) { struct inode *inode = dentry->d_inode; @@ -667,6 +681,7 @@ static void shmem_delete_inode(struct inode *inode) struct shmem_inode_info *info = SHMEM_I(inode); if (inode->i_op->truncate == shmem_truncate) { + truncate_inode_pages(inode->i_mapping, 0); shmem_unacct_size(info->flags, inode->i_size); inode->i_size = 0; shmem_truncate(inode); @@ -676,8 +691,8 @@ static void shmem_delete_inode(struct inode *inode) spin_unlock(&shmem_swaplist_lock); } } - if (sbinfo) { - BUG_ON(inode->i_blocks); + BUG_ON(inode->i_blocks); + if (sbinfo->max_inodes) { spin_lock(&sbinfo->stat_lock); sbinfo->free_inodes++; spin_unlock(&sbinfo->stat_lock); @@ -743,7 +758,7 @@ static int shmem_unuse_inode(struct shmem_inode_info *info, swp_entry_t entry, s dir = shmem_dir_map(subdir); } subdir = *dir; - if (subdir && subdir->nr_swapped) { + if (subdir && page_private(subdir)) { ptr = shmem_swp_map(subdir); size = limit - idx; if (size > ENTRIES_PER_PAGE) @@ -857,10 +872,55 @@ unlock: swap_free(swap); redirty: set_page_dirty(page); - return WRITEPAGE_ACTIVATE; /* Return with the page locked */ + return AOP_WRITEPAGE_ACTIVATE; /* Return with the page locked */ } #ifdef CONFIG_NUMA +static inline 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 (!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 nodes online if no nodelist */ + if (!nodelist) + *policy_nodes = node_online_map; + err = 0; + } +out: + /* Restore string for error message */ + if (nodelist) + *--nodelist = ':'; + return err; +} + static struct page *shmem_swapin_async(struct shared_policy *p, swp_entry_t entry, unsigned long idx) { @@ -898,7 +958,7 @@ struct page *shmem_swapin(struct shmem_inode_info *info, swp_entry_t entry, } static struct page * -shmem_alloc_page(unsigned long gfp, struct shmem_inode_info *info, +shmem_alloc_page(gfp_t gfp, struct shmem_inode_info *info, unsigned long idx) { struct vm_area_struct pvma; @@ -913,6 +973,11 @@ shmem_alloc_page(unsigned long gfp, struct shmem_inode_info *info, return page; } #else +static inline int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_nodes) +{ + return 1; +} + static inline struct page * shmem_swapin(struct shmem_inode_info *info,swp_entry_t entry,unsigned long idx) { @@ -921,8 +986,7 @@ shmem_swapin(struct shmem_inode_info *info,swp_entry_t entry,unsigned long idx) } static inline struct page * -shmem_alloc_page(unsigned int __nocast gfp,struct shmem_inode_info *info, - unsigned long idx) +shmem_alloc_page(gfp_t gfp,struct shmem_inode_info *info, unsigned long idx) { return alloc_page(gfp | __GFP_ZERO); } @@ -1016,6 +1080,14 @@ repeat: page_cache_release(swappage); goto repeat; } + if (!PageSwapCache(swappage)) { + /* Page migration has occured */ + shmem_swp_unmap(entry); + spin_unlock(&info->lock); + unlock_page(swappage); + page_cache_release(swappage); + goto repeat; + } if (PageWriteback(swappage)) { shmem_swp_unmap(entry); spin_unlock(&info->lock); @@ -1079,7 +1151,7 @@ repeat: } else { shmem_swp_unmap(entry); sbinfo = SHMEM_SB(inode->i_sb); - if (sbinfo) { + if (sbinfo->max_blocks) { spin_lock(&sbinfo->stat_lock); if (sbinfo->free_blocks == 0 || shmem_acct_block(info->flags)) { @@ -1194,6 +1266,7 @@ static int shmem_populate(struct vm_area_struct *vma, err = shmem_getpage(inode, pgoff, &page, sgp, NULL); if (err) return err; + /* Page may still be null, but only if nonblock was set. */ if (page) { mark_page_accessed(page); err = install_page(mm, vma, addr, page, prot); @@ -1201,7 +1274,10 @@ static int shmem_populate(struct vm_area_struct *vma, page_cache_release(page); return err; } - } else if (nonblock) { + } else if (vma->vm_flags & VM_NONLINEAR) { + /* No page was found just because we can't read it in + * now (being here implies nonblock != 0), but the page + * may exist, so set the PTE to fault it in later. */ err = install_file_pte(mm, vma, addr, pgoff, prot); if (err) return err; @@ -1254,7 +1330,7 @@ out_nomem: return retval; } -static int shmem_mmap(struct file *file, struct vm_area_struct *vma) +int shmem_mmap(struct file *file, struct vm_area_struct *vma) { file_accessed(file); vma->vm_ops = &shmem_vm_ops; @@ -1268,7 +1344,7 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev) struct shmem_inode_info *info; struct shmem_sb_info *sbinfo = SHMEM_SB(sb); - if (sbinfo) { + if (sbinfo->max_inodes) { spin_lock(&sbinfo->stat_lock); if (!sbinfo->free_inodes) { spin_unlock(&sbinfo->stat_lock); @@ -1295,13 +1371,13 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev) switch (mode & S_IFMT) { default: - inode->i_op = &shmem_special_inode_operations; init_special_inode(inode, mode, dev); break; case S_IFREG: inode->i_op = &shmem_inode_operations; inode->i_fop = &shmem_file_operations; - mpol_shared_policy_init(&info->policy); + mpol_shared_policy_init(&info->policy, sbinfo->policy, + &sbinfo->policy_nodes); break; case S_IFDIR: inode->i_nlink++; @@ -1315,10 +1391,11 @@ 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_shared_policy_init(&info->policy, MPOL_DEFAULT, + NULL); break; } - } else if (sbinfo) { + } else if (sbinfo->max_inodes) { spin_lock(&sbinfo->stat_lock); sbinfo->free_inodes++; spin_unlock(&sbinfo->stat_lock); @@ -1327,31 +1404,6 @@ shmem_get_inode(struct super_block *sb, int mode, dev_t dev) } #ifdef CONFIG_TMPFS - -static int shmem_set_size(struct shmem_sb_info *sbinfo, - unsigned long max_blocks, unsigned long max_inodes) -{ - int error; - unsigned long blocks, inodes; - - spin_lock(&sbinfo->stat_lock); - blocks = sbinfo->max_blocks - sbinfo->free_blocks; - inodes = sbinfo->max_inodes - sbinfo->free_inodes; - error = -EINVAL; - if (max_blocks < blocks) - goto out; - if (max_inodes < inodes) - goto out; - error = 0; - sbinfo->max_blocks = max_blocks; - sbinfo->free_blocks = max_blocks - blocks; - sbinfo->max_inodes = max_inodes; - sbinfo->free_inodes = max_inodes - inodes; -out: - spin_unlock(&sbinfo->stat_lock); - return error; -} - static struct inode_operations shmem_symlink_inode_operations; static struct inode_operations shmem_symlink_inline_operations; @@ -1380,7 +1432,7 @@ shmem_file_write(struct file *file, const char __user *buf, size_t count, loff_t if (!access_ok(VERIFY_READ, buf, count)) return -EFAULT; - down(&inode->i_sem); + mutex_lock(&inode->i_mutex); pos = *ppos; written = 0; @@ -1465,7 +1517,7 @@ shmem_file_write(struct file *file, const char __user *buf, size_t count, loff_t if (written) err = written; out: - up(&inode->i_sem); + mutex_unlock(&inode->i_mutex); return err; } @@ -1501,7 +1553,7 @@ static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_ /* * We must evaluate after, since reads (unlike writes) - * are called without i_sem protection against truncate + * are called without i_mutex protection against truncate */ nr = PAGE_CACHE_SIZE; i_size = i_size_read(inode); @@ -1529,8 +1581,10 @@ static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_ */ if (!offset) mark_page_accessed(page); - } else + } else { page = ZERO_PAGE(0); + page_cache_get(page); + } /* * Ok, we have the page, and it's up-to-date, so @@ -1606,15 +1660,17 @@ static int shmem_statfs(struct super_block *sb, struct kstatfs *buf) buf->f_type = TMPFS_SUPER_MAGIC; buf->f_bsize = PAGE_CACHE_SIZE; buf->f_namelen = NAME_MAX; - if (sbinfo) { - spin_lock(&sbinfo->stat_lock); + spin_lock(&sbinfo->stat_lock); + if (sbinfo->max_blocks) { buf->f_blocks = sbinfo->max_blocks; buf->f_bavail = buf->f_bfree = sbinfo->free_blocks; + } + if (sbinfo->max_inodes) { buf->f_files = sbinfo->max_inodes; buf->f_ffree = sbinfo->free_inodes; - spin_unlock(&sbinfo->stat_lock); } /* else leave those fields 0 like simple_statfs */ + spin_unlock(&sbinfo->stat_lock); return 0; } @@ -1628,6 +1684,15 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) int error = -ENOSPC; if (inode) { + error = security_inode_init_security(inode, dir, NULL, NULL, + NULL); + if (error) { + if (error != -EOPNOTSUPP) { + iput(inode); + return error; + } + error = 0; + } if (dir->i_mode & S_ISGID) { inode->i_gid = dir->i_gid; if (S_ISDIR(mode)) @@ -1637,7 +1702,6 @@ shmem_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) dir->i_ctime = dir->i_mtime = CURRENT_TIME; d_instantiate(dentry, inode); dget(dentry); /* Extra count - pin the dentry in core */ - error = 0; } return error; } @@ -1671,7 +1735,7 @@ static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentr * but each new link needs a new dentry, pinning lowmem, and * tmpfs dentries cannot be pruned until they are unlinked. */ - if (sbinfo) { + if (sbinfo->max_inodes) { spin_lock(&sbinfo->stat_lock); if (!sbinfo->free_inodes) { spin_unlock(&sbinfo->stat_lock); @@ -1696,7 +1760,7 @@ static int shmem_unlink(struct inode *dir, struct dentry *dentry) if (inode->i_nlink > 1 && !S_ISDIR(inode->i_mode)) { struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); - if (sbinfo) { + if (sbinfo->max_inodes) { spin_lock(&sbinfo->stat_lock); sbinfo->free_inodes++; spin_unlock(&sbinfo->stat_lock); @@ -1715,6 +1779,7 @@ static int shmem_rmdir(struct inode *dir, struct dentry *dentry) if (!simple_empty(dentry)) return -ENOTEMPTY; + dentry->d_inode->i_nlink--; dir->i_nlink--; return shmem_unlink(dir, dentry); } @@ -1767,6 +1832,16 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s if (!inode) return -ENOSPC; + error = security_inode_init_security(inode, dir, NULL, NULL, + NULL); + if (error) { + if (error != -EOPNOTSUPP) { + iput(inode); + return error; + } + error = 0; + } + info = SHMEM_I(inode); inode->i_size = len-1; if (len <= (char *)inode - (char *)info) { @@ -1795,44 +1870,33 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s return 0; } -static int shmem_follow_link_inline(struct dentry *dentry, struct nameidata *nd) +static void *shmem_follow_link_inline(struct dentry *dentry, struct nameidata *nd) { nd_set_link(nd, (char *)SHMEM_I(dentry->d_inode)); - return 0; + return NULL; } -static int shmem_follow_link(struct dentry *dentry, struct nameidata *nd) +static void *shmem_follow_link(struct dentry *dentry, struct nameidata *nd) { struct page *page = NULL; int res = shmem_getpage(dentry->d_inode, 0, &page, SGP_READ, NULL); nd_set_link(nd, res ? ERR_PTR(res) : kmap(page)); - return 0; + return page; } -static void shmem_put_link(struct dentry *dentry, struct nameidata *nd) +static void shmem_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie) { if (!IS_ERR(nd_get_link(nd))) { - struct page *page; - - page = find_get_page(dentry->d_inode->i_mapping, 0); - if (!page) - BUG(); + struct page *page = cookie; kunmap(page); mark_page_accessed(page); page_cache_release(page); - page_cache_release(page); } } static struct inode_operations shmem_symlink_inline_operations = { .readlink = generic_readlink, .follow_link = shmem_follow_link_inline, -#ifdef CONFIG_TMPFS_XATTR - .setxattr = generic_setxattr, - .getxattr = generic_getxattr, - .listxattr = generic_listxattr, - .removexattr = generic_removexattr, -#endif }; static struct inode_operations shmem_symlink_inode_operations = { @@ -1840,19 +1904,31 @@ static struct inode_operations shmem_symlink_inode_operations = { .readlink = generic_readlink, .follow_link = shmem_follow_link, .put_link = shmem_put_link, -#ifdef CONFIG_TMPFS_XATTR - .setxattr = generic_setxattr, - .getxattr = generic_getxattr, - .listxattr = generic_listxattr, - .removexattr = generic_removexattr, -#endif }; -static int shmem_parse_options(char *options, int *mode, uid_t *uid, gid_t *gid, unsigned long *blocks, unsigned long *inodes) +static int shmem_parse_options(char *options, int *mode, uid_t *uid, + gid_t *gid, unsigned long *blocks, unsigned long *inodes, + int *policy, nodemask_t *policy_nodes) { char *this_char, *value, *rest; - while ((this_char = strsep(&options, ",")) != NULL) { + while (options != NULL) { + this_char = options; + for (;;) { + /* + * NUL-terminate this option: unfortunately, + * mount options form a comma-separated list, + * but mpol's nodelist may also contain commas. + */ + options = strchr(options, ','); + if (options == NULL) + break; + options++; + if (!isdigit(*options)) { + options[-1] = '\0'; + break; + } + } if (!*this_char) continue; if ((value = strchr(this_char,'=')) != NULL) { @@ -1902,6 +1978,9 @@ static int shmem_parse_options(char *options, int *mode, uid_t *uid, gid_t *gid, *gid = simple_strtoul(value,&rest,0); if (*rest) goto bad_val; + } else if (!strcmp(this_char,"mpol")) { + if (shmem_parse_mpol(value,policy,policy_nodes)) + goto bad_val; } else { printk(KERN_ERR "tmpfs: Bad mount option %s\n", this_char); @@ -1920,22 +1999,46 @@ bad_val: static int shmem_remount_fs(struct super_block *sb, int *flags, char *data) { struct shmem_sb_info *sbinfo = SHMEM_SB(sb); - unsigned long max_blocks = 0; - unsigned long max_inodes = 0; + unsigned long max_blocks = sbinfo->max_blocks; + unsigned long max_inodes = sbinfo->max_inodes; + int policy = sbinfo->policy; + nodemask_t policy_nodes = sbinfo->policy_nodes; + unsigned long blocks; + unsigned long inodes; + int error = -EINVAL; + + if (shmem_parse_options(data, NULL, NULL, NULL, &max_blocks, + &max_inodes, &policy, &policy_nodes)) + return error; - if (sbinfo) { - max_blocks = sbinfo->max_blocks; - max_inodes = sbinfo->max_inodes; - } - if (shmem_parse_options(data, NULL, NULL, NULL, &max_blocks, &max_inodes)) - return -EINVAL; - /* Keep it simple: disallow limited <-> unlimited remount */ - if ((max_blocks || max_inodes) == !sbinfo) - return -EINVAL; - /* But allow the pointless unlimited -> unlimited remount */ - if (!sbinfo) - return 0; - return shmem_set_size(sbinfo, max_blocks, max_inodes); + spin_lock(&sbinfo->stat_lock); + blocks = sbinfo->max_blocks - sbinfo->free_blocks; + inodes = sbinfo->max_inodes - sbinfo->free_inodes; + if (max_blocks < blocks) + goto out; + if (max_inodes < inodes) + goto out; + /* + * Those tests also disallow limited->unlimited while any are in + * use, so i_blocks will always be zero when max_blocks is zero; + * but we must separately disallow unlimited->limited, because + * in that case we have no record of how much is already in use. + */ + if (max_blocks && !sbinfo->max_blocks) + goto out; + if (max_inodes && !sbinfo->max_inodes) + goto out; + + error = 0; + sbinfo->max_blocks = max_blocks; + sbinfo->free_blocks = max_blocks - blocks; + sbinfo->max_inodes = max_inodes; + sbinfo->free_inodes = max_inodes - inodes; + sbinfo->policy = policy; + sbinfo->policy_nodes = policy_nodes; +out: + spin_unlock(&sbinfo->stat_lock); + return error; } #endif @@ -1945,12 +2048,6 @@ static void shmem_put_super(struct super_block *sb) sb->s_fs_info = NULL; } -#ifdef CONFIG_TMPFS_XATTR -static struct xattr_handler *shmem_xattr_handlers[]; -#else -#define shmem_xattr_handlers NULL -#endif - static int shmem_fill_super(struct super_block *sb, void *data, int silent) { @@ -1960,11 +2057,13 @@ static int shmem_fill_super(struct super_block *sb, uid_t uid = current->fsuid; gid_t gid = current->fsgid; int err = -ENOMEM; - -#ifdef CONFIG_TMPFS + struct shmem_sb_info *sbinfo; unsigned long blocks = 0; unsigned long inodes = 0; + int policy = MPOL_DEFAULT; + nodemask_t policy_nodes = node_online_map; +#ifdef CONFIG_TMPFS /* * Per default we only allow half of the physical ram per * tmpfs instance, limiting inodes to one per page of lowmem; @@ -1975,34 +2074,36 @@ static int shmem_fill_super(struct super_block *sb, inodes = totalram_pages - totalhigh_pages; if (inodes > blocks) inodes = blocks; - - if (shmem_parse_options(data, &mode, - &uid, &gid, &blocks, &inodes)) + if (shmem_parse_options(data, &mode, &uid, &gid, &blocks, + &inodes, &policy, &policy_nodes)) return -EINVAL; } - - if (blocks || inodes) { - struct shmem_sb_info *sbinfo; - sbinfo = kmalloc(sizeof(struct shmem_sb_info), GFP_KERNEL); - if (!sbinfo) - return -ENOMEM; - sb->s_fs_info = sbinfo; - spin_lock_init(&sbinfo->stat_lock); - sbinfo->max_blocks = blocks; - sbinfo->free_blocks = blocks; - sbinfo->max_inodes = inodes; - sbinfo->free_inodes = inodes; - } - sb->s_xattr = shmem_xattr_handlers; #else sb->s_flags |= MS_NOUSER; #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); + sbinfo->max_blocks = blocks; + sbinfo->free_blocks = blocks; + 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_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_magic = TMPFS_SUPER_MAGIC; sb->s_op = &shmem_ops; + sb->s_time_gran = 1; + inode = shmem_get_inode(sb, S_IFDIR | mode, 0); if (!inode) goto failed; @@ -2021,7 +2122,7 @@ failed: return err; } -static kmem_cache_t *shmem_inode_cachep; +static struct kmem_cache *shmem_inode_cachep; static struct inode *shmem_alloc_inode(struct super_block *sb) { @@ -2041,7 +2142,8 @@ static void shmem_destroy_inode(struct inode *inode) kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode)); } -static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags) +static void init_once(void *foo, struct kmem_cache *cachep, + unsigned long flags) { struct shmem_inode_info *p = (struct shmem_inode_info *) foo; @@ -2074,6 +2176,7 @@ static struct address_space_operations shmem_aops = { .prepare_write = shmem_prepare_write, .commit_write = simple_commit_write, #endif + .migratepage = migrate_page, }; static struct file_operations shmem_file_operations = { @@ -2090,12 +2193,7 @@ static struct file_operations shmem_file_operations = { static struct inode_operations shmem_inode_operations = { .truncate = shmem_truncate, .setattr = shmem_notify_change, -#ifdef CONFIG_TMPFS_XATTR - .setxattr = generic_setxattr, - .getxattr = generic_getxattr, - .listxattr = generic_listxattr, - .removexattr = generic_removexattr, -#endif + .truncate_range = shmem_truncate_range, }; static struct inode_operations shmem_dir_inode_operations = { @@ -2109,21 +2207,6 @@ static struct inode_operations shmem_dir_inode_operations = { .rmdir = shmem_rmdir, .mknod = shmem_mknod, .rename = shmem_rename, -#ifdef CONFIG_TMPFS_XATTR - .setxattr = generic_setxattr, - .getxattr = generic_getxattr, - .listxattr = generic_listxattr, - .removexattr = generic_removexattr, -#endif -#endif -}; - -static struct inode_operations shmem_special_inode_operations = { -#ifdef CONFIG_TMPFS_XATTR - .setxattr = generic_setxattr, - .getxattr = generic_getxattr, - .listxattr = generic_listxattr, - .removexattr = generic_removexattr, #endif }; @@ -2149,48 +2232,6 @@ static struct vm_operations_struct shmem_vm_ops = { }; -#ifdef CONFIG_TMPFS_SECURITY - -static size_t shmem_xattr_security_list(struct inode *inode, char *list, size_t list_len, - const char *name, size_t name_len) -{ - return security_inode_listsecurity(inode, list, list_len); -} - -static int shmem_xattr_security_get(struct inode *inode, const char *name, void *buffer, size_t size) -{ - if (strcmp(name, "") == 0) - return -EINVAL; - return security_inode_getsecurity(inode, name, buffer, size); -} - -static int shmem_xattr_security_set(struct inode *inode, const char *name, const void *value, size_t size, int flags) -{ - if (strcmp(name, "") == 0) - return -EINVAL; - return security_inode_setsecurity(inode, name, value, size, flags); -} - -static struct xattr_handler shmem_xattr_security_handler = { - .prefix = XATTR_SECURITY_PREFIX, - .list = shmem_xattr_security_list, - .get = shmem_xattr_security_get, - .set = shmem_xattr_security_set, -}; - -#endif /* CONFIG_TMPFS_SECURITY */ - -#ifdef CONFIG_TMPFS_XATTR - -static struct xattr_handler *shmem_xattr_handlers[] = { -#ifdef CONFIG_TMPFS_SECURITY - &shmem_xattr_security_handler, -#endif - NULL -}; - -#endif /* CONFIG_TMPFS_XATTR */ - static struct super_block *shmem_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) {