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authorAnatol Pomozov <anatol.pomozov@gmail.com>2012-09-13 07:11:55 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-02-23 08:31:32 +0400
commit39b652527457452f09b35044fb4f8b3b0eabafdf (patch)
treeacd8fda1d4e37c58c68fe0cfb9288d5d06e14441 /fs
parent1afc99beaf0fca3767d9b67789a7ae91c4f7a9c9 (diff)
downloadlinux-39b652527457452f09b35044fb4f8b3b0eabafdf.tar.xz
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 <anatol.pomozov@gmail.com> Reviewed-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/anon_inodes.c8
-rw-r--r--fs/file_table.c2
-rw-r--r--fs/hugetlbfs/inode.c12
-rw-r--r--fs/pipe.c4
4 files changed, 11 insertions, 15 deletions
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);