From 782182e53a6cdb3e3d04cc40516e173046942a32 Mon Sep 17 00:00:00 2001 From: Cong Wang Date: Tue, 29 May 2012 15:06:43 -0700 Subject: mm: move readahead syscall to mm/readahead.c It is better to define readahead(2) in mm/readahead.c than in mm/filemap.c. Signed-off-by: Cong Wang Cc: Fengguang Wu Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/filemap.c | 39 --------------------------------------- 1 file changed, 39 deletions(-) (limited to 'mm/filemap.c') diff --git a/mm/filemap.c b/mm/filemap.c index 79c4b2b0b14e..64b48f934b89 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -29,7 +29,6 @@ #include #include #include -#include #include #include /* for BUG_ON(!in_atomic()) only */ #include @@ -1478,44 +1477,6 @@ out: } EXPORT_SYMBOL(generic_file_aio_read); -static ssize_t -do_readahead(struct address_space *mapping, struct file *filp, - pgoff_t index, unsigned long nr) -{ - if (!mapping || !mapping->a_ops || !mapping->a_ops->readpage) - return -EINVAL; - - force_page_cache_readahead(mapping, filp, index, nr); - return 0; -} - -SYSCALL_DEFINE(readahead)(int fd, loff_t offset, size_t count) -{ - ssize_t ret; - struct file *file; - - ret = -EBADF; - file = fget(fd); - if (file) { - if (file->f_mode & FMODE_READ) { - struct address_space *mapping = file->f_mapping; - pgoff_t start = offset >> PAGE_CACHE_SHIFT; - pgoff_t end = (offset + count - 1) >> PAGE_CACHE_SHIFT; - unsigned long len = end - start + 1; - ret = do_readahead(mapping, file, start, len); - } - fput(file); - } - return ret; -} -#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS -asmlinkage long SyS_readahead(long fd, loff_t offset, long count) -{ - return SYSC_readahead((int) fd, offset, (size_t) count); -} -SYSCALL_ALIAS(sys_readahead, SyS_readahead); -#endif - #ifdef CONFIG_MMU /** * page_cache_read - adds requested page to the page cache if not already there -- cgit v1.2.2 From 3ed37648e1cbf1bbebc200c6ea8fd8daf8325843 Mon Sep 17 00:00:00 2001 From: Cong Wang Date: Tue, 15 May 2012 14:57:33 +0800 Subject: fs: move file_remove_suid() to fs/inode.c file_remove_suid() is a generic function operates on struct file, it almost has no relations with file mapping, so move it to fs/inode.c. Cc: Alexander Viro Signed-off-by: Cong Wang Signed-off-by: Al Viro --- mm/filemap.c | 65 ------------------------------------------------------------ 1 file changed, 65 deletions(-) (limited to 'mm/filemap.c') diff --git a/mm/filemap.c b/mm/filemap.c index 79c4b2b0b14e..21e5abfbcdf6 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1938,71 +1938,6 @@ struct page *read_cache_page(struct address_space *mapping, } EXPORT_SYMBOL(read_cache_page); -/* - * The logic we want is - * - * if suid or (sgid and xgrp) - * remove privs - */ -int should_remove_suid(struct dentry *dentry) -{ - umode_t mode = dentry->d_inode->i_mode; - int kill = 0; - - /* suid always must be killed */ - if (unlikely(mode & S_ISUID)) - kill = ATTR_KILL_SUID; - - /* - * sgid without any exec bits is just a mandatory locking mark; leave - * it alone. If some exec bits are set, it's a real sgid; kill it. - */ - if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) - kill |= ATTR_KILL_SGID; - - if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode))) - return kill; - - return 0; -} -EXPORT_SYMBOL(should_remove_suid); - -static int __remove_suid(struct dentry *dentry, int kill) -{ - struct iattr newattrs; - - newattrs.ia_valid = ATTR_FORCE | kill; - return notify_change(dentry, &newattrs); -} - -int file_remove_suid(struct file *file) -{ - struct dentry *dentry = file->f_path.dentry; - struct inode *inode = dentry->d_inode; - int killsuid; - int killpriv; - int error = 0; - - /* Fast path for nothing security related */ - if (IS_NOSEC(inode)) - return 0; - - killsuid = should_remove_suid(dentry); - killpriv = security_inode_need_killpriv(dentry); - - if (killpriv < 0) - return killpriv; - if (killpriv) - error = security_inode_killpriv(dentry); - if (!error && killsuid) - error = __remove_suid(dentry, killsuid); - if (!error && (inode->i_sb->s_flags & MS_NOSEC)) - inode->i_flags |= S_NOSEC; - - return error; -} -EXPORT_SYMBOL(file_remove_suid); - static size_t __iovec_copy_from_user_inatomic(char *vaddr, const struct iovec *iov, size_t base, size_t bytes) { -- cgit v1.2.2 From c3b2da314834499f34cba94f7053e55f6d6f92d8 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Mon, 26 Mar 2012 09:59:21 -0400 Subject: fs: introduce inode operation ->update_time Btrfs has to make sure we have space to allocate new blocks in order to modify the inode, so updating time can fail. We've gotten around this by having our own file_update_time but this is kind of a pain, and Christoph has indicated he would like to make xfs do something different with atime updates. So introduce ->update_time, where we will deal with i_version an a/m/c time updates and indicate which changes need to be made. The normal version just does what it has always done, updates the time and marks the inode dirty, and then filesystems can choose to do something different. I've gone through all of the users of file_update_time and made them check for errors with the exception of the fault code since it's complicated and I wasn't quite sure what to do there, also Jan is going to be pushing the file time updates into page_mkwrite for those who have it so that should satisfy btrfs and make it not a big deal to check the file_update_time() return code in the generic fault path. Thanks, Signed-off-by: Josef Bacik --- mm/filemap.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'mm/filemap.c') diff --git a/mm/filemap.c b/mm/filemap.c index 21e5abfbcdf6..51070f1f1b52 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2463,7 +2463,9 @@ ssize_t __generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov, if (err) goto out; - file_update_time(file); + err = file_update_time(file); + if (err) + goto out; /* coalesce the iovecs and go direct-to-BIO for O_DIRECT */ if (unlikely(file->f_flags & O_DIRECT)) { -- cgit v1.2.2