X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mm%2Fshmem.c;h=1f7aeb210c7bf4de0c845f65d9c2b2b77cfe8ef0;hb=2d21247998c5d183179a7e822c4032974a53ff49;hp=e64fa726a790e0c4162fec88db0e1032dd8a5be0;hpb=5d2a22079c825669d91a3a200332f1053b4b61b0;p=pandora-kernel.git diff --git a/mm/shmem.c b/mm/shmem.c index e64fa726a790..1f7aeb210c7b 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -45,7 +45,6 @@ #include #include #include -#include #include #include #include @@ -179,10 +178,9 @@ 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, @@ -668,6 +666,7 @@ 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); @@ -1195,6 +1194,7 @@ 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); @@ -1202,7 +1202,10 @@ static int shmem_populate(struct vm_area_struct *vma, page_cache_release(page); return err; } - } else if (nonblock) { + } else { + /* 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; @@ -1296,7 +1299,6 @@ 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: @@ -1606,6 +1608,15 @@ 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)) @@ -1615,7 +1626,6 @@ 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; } @@ -1745,6 +1755,16 @@ 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) { @@ -1773,44 +1793,33 @@ 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 = { @@ -1818,12 +1827,6 @@ 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) @@ -1943,12 +1946,6 @@ 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) { @@ -1999,7 +1996,6 @@ static int shmem_fill_super(struct super_block *sb, sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_magic = TMPFS_MAGIC; sb->s_op = &shmem_ops; - sb->s_xattr = shmem_xattr_handlers; inode = shmem_get_inode(sb, S_IFDIR | mode, 0); if (!inode) @@ -2088,12 +2084,6 @@ 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 }; static struct inode_operations shmem_dir_inode_operations = { @@ -2107,21 +2097,6 @@ 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 }; @@ -2147,48 +2122,6 @@ 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) {