From 39b652527457452f09b35044fb4f8b3b0eabafdf Mon Sep 17 00:00:00 2001 From: Anatol Pomozov Date: Wed, 12 Sep 2012 20:11:55 -0700 Subject: [PATCH] fs: Preserve error code in get_empty_filp(), part 2 Allocating a file structure in function get_empty_filp() might fail because of several reasons: - not enough memory for file structures - operation is not allowed - user is over its limit Currently the function returns NULL in all cases and we loose the exact reason of the error. All callers of get_empty_filp() assume that the function can fail with ENFILE only. Return error through pointer. Change all callers to preserve this error code. [AV: cleaned up a bit, carved the get_empty_filp() part out into a separate commit (things remaining here deal with alloc_file()), removed pipe(2) behaviour change] Signed-off-by: Anatol Pomozov Reviewed-by: "Theodore Ts'o" Signed-off-by: Al Viro --- arch/ia64/kernel/perfmon.c | 4 ++-- fs/anon_inodes.c | 8 +++----- fs/file_table.c | 2 +- fs/hugetlbfs/inode.c | 12 +++++------- fs/pipe.c | 4 ++-- ipc/shm.c | 3 ++- mm/shmem.c | 4 ++-- net/socket.c | 4 ++-- 8 files changed, 19 insertions(+), 22 deletions(-) diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c index ea39eba61ef5..433f5e8a2cd1 100644 --- a/arch/ia64/kernel/perfmon.c +++ b/arch/ia64/kernel/perfmon.c @@ -2221,9 +2221,9 @@ pfm_alloc_file(pfm_context_t *ctx) d_add(path.dentry, inode); file = alloc_file(&path, FMODE_READ, &pfm_file_ops); - if (!file) { + if (IS_ERR(file)) { path_put(&path); - return ERR_PTR(-ENFILE); + return file; } file->f_flags = O_RDONLY; diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c index 28d39fb84ae3..a14eb0c1cd8c 100644 --- a/fs/anon_inodes.c +++ b/fs/anon_inodes.c @@ -131,7 +131,6 @@ struct file *anon_inode_getfile(const char *name, struct qstr this; struct path path; struct file *file; - int error; if (IS_ERR(anon_inode_inode)) return ERR_PTR(-ENODEV); @@ -143,7 +142,7 @@ struct file *anon_inode_getfile(const char *name, * Link the inode to a directory entry by creating a unique name * using the inode sequence number. */ - error = -ENOMEM; + file = ERR_PTR(-ENOMEM); this.name = name; this.len = strlen(name); this.hash = 0; @@ -160,9 +159,8 @@ struct file *anon_inode_getfile(const char *name, d_instantiate(path.dentry, anon_inode_inode); - error = -ENFILE; file = alloc_file(&path, OPEN_FMODE(flags), fops); - if (!file) + if (IS_ERR(file)) goto err_dput; file->f_mapping = anon_inode_inode->i_mapping; @@ -177,7 +175,7 @@ err_dput: path_put(&path); err_module: module_put(fops->owner); - return ERR_PTR(error); + return file; } EXPORT_SYMBOL_GPL(anon_inode_getfile); diff --git a/fs/file_table.c b/fs/file_table.c index cd76d4fdf4a4..aa07d3684a2e 100644 --- a/fs/file_table.c +++ b/fs/file_table.c @@ -173,7 +173,7 @@ struct file *alloc_file(struct path *path, fmode_t mode, file = get_empty_filp(); if (IS_ERR(file)) - return NULL; + return file; file->f_path = *path; file->f_mapping = path->dentry->d_inode->i_mapping; diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index edb42ea60c76..99fe7ef2f09b 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -923,8 +923,7 @@ struct file *hugetlb_file_setup(const char *name, unsigned long addr, struct user_struct **user, int creat_flags, int page_size_log) { - int error = -ENOMEM; - struct file *file; + struct file *file = ERR_PTR(-ENOMEM); struct inode *inode; struct path path; struct dentry *root; @@ -964,7 +963,7 @@ struct file *hugetlb_file_setup(const char *name, unsigned long addr, goto out_shm_unlock; path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]); - error = -ENOSPC; + file = ERR_PTR(-ENOSPC); inode = hugetlbfs_get_inode(root->d_sb, NULL, S_IFREG | S_IRWXUGO, 0); if (!inode) goto out_dentry; @@ -973,7 +972,7 @@ struct file *hugetlb_file_setup(const char *name, unsigned long addr, size += addr & ~huge_page_mask(hstate); num_pages = ALIGN(size, huge_page_size(hstate)) >> huge_page_shift(hstate); - error = -ENOMEM; + file = ERR_PTR(-ENOMEM); if (hugetlb_reserve_pages(inode, 0, num_pages, NULL, acctflag)) goto out_inode; @@ -981,10 +980,9 @@ struct file *hugetlb_file_setup(const char *name, unsigned long addr, inode->i_size = size; clear_nlink(inode); - error = -ENFILE; file = alloc_file(&path, FMODE_WRITE | FMODE_READ, &hugetlbfs_file_operations); - if (!file) + if (IS_ERR(file)) goto out_dentry; /* inode is already attached */ return file; @@ -998,7 +996,7 @@ out_shm_unlock: user_shm_unlock(size, *user); *user = NULL; } - return ERR_PTR(error); + return file; } static int __init init_hugetlbfs_fs(void) diff --git a/fs/pipe.c b/fs/pipe.c index 39baf6c3ebb0..64a494cef0a0 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -1037,13 +1037,13 @@ int create_pipe_files(struct file **res, int flags) err = -ENFILE; f = alloc_file(&path, FMODE_WRITE, &write_pipefifo_fops); - if (!f) + if (IS_ERR(f)) goto err_dentry; f->f_flags = O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT)); res[0] = alloc_file(&path, FMODE_READ, &read_pipefifo_fops); - if (!res[0]) + if (IS_ERR(res[0])) goto err_file; path_get(&path); diff --git a/ipc/shm.c b/ipc/shm.c index 8c9402d298a0..de389e639e7e 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -1042,7 +1042,8 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr, is_file_hugepages(shp->shm_file) ? &shm_file_operations_huge : &shm_file_operations); - if (!file) + err = PTR_ERR(file); + if (IS_ERR(file)) goto out_free; file->private_data = sfd; diff --git a/mm/shmem.c b/mm/shmem.c index 814d5546cb35..abf07f754277 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2913,10 +2913,10 @@ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags goto put_dentry; #endif - error = -ENFILE; file = alloc_file(&path, FMODE_WRITE | FMODE_READ, &shmem_file_operations); - if (!file) + error = PTR_ERR(file); + if (IS_ERR(file)) goto put_dentry; return file; diff --git a/net/socket.c b/net/socket.c index 2ca51c719ef9..f4a8c5a0b8d7 100644 --- a/net/socket.c +++ b/net/socket.c @@ -370,11 +370,11 @@ struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) file = alloc_file(&path, FMODE_READ | FMODE_WRITE, &socket_file_ops); - if (unlikely(!file)) { + if (unlikely(IS_ERR(file))) { /* drop dentry, keep inode */ ihold(path.dentry->d_inode); path_put(&path); - return ERR_PTR(-ENFILE); + return file; } sock->file = file;