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take rlimit check to callers of expand_files() 

... except for one in android, where the check is different
and already done in caller.  No need to recalculate rlimit
many times in alloc_fd() either.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-08-12 16:17:59 -04:00
parent 352e3b2492
commit f33ff9927f
2 changed files with 12 additions and 7 deletions
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3
fs/fcntl.c
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@ -64,6 +64,9 @@ SYSCALL_DEFINE3(dup3, unsigned int, oldfd, unsigned int, newfd, int, flags)
if (unlikely(oldfd == newfd))
return -EINVAL;
if (newfd >= rlimit(RLIMIT_NOFILE))
return -EMFILE;
spin_lock(&files->file_lock);
err = expand_files(files, newfd);
file = fcheck(oldfd);

16
fs/file.c
View File

@ -251,13 +251,6 @@ int expand_files(struct files_struct *files, int nr)
fdt = files_fdtable(files);
/*
* N.B. For clone tasks sharing a files structure, this test
* will limit the total number of files that can be opened.
*/
if (nr >= rlimit(RLIMIT_NOFILE))
return -EMFILE;
/* Do we need to expand? */
if (nr < fdt->max_fds)
return 0;
@ -431,6 +424,7 @@ int alloc_fd(unsigned start, unsigned flags)
{
struct files_struct *files = current->files;
unsigned int fd;
unsigned end = rlimit(RLIMIT_NOFILE);
int error;
struct fdtable *fdt;
@ -444,6 +438,14 @@ int alloc_fd(unsigned start, unsigned flags)
if (fd < fdt->max_fds)
fd = find_next_zero_bit(fdt->open_fds, fdt->max_fds, fd);
/*
* N.B. For clone tasks sharing a files structure, this test
* will limit the total number of files that can be opened.
*/
error = -EMFILE;
if (fd >= end)
goto out;
error = expand_files(files, fd);
if (error < 0)
goto out;