[readdir] convert efs

[firefly-linux-kernel-4.4.55.git] / fs / read_write.c

diff --git a/fs/read_write.c b/fs/read_write.c
index 90ba3b350e5063daa547f35814fd5e4c8c660a4f..2cefa417be349b0016ffa8606635db9e85751015 100644 (file)
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -9,6 +9,7 @@
 #include <linux/fcntl.h>
 #include <linux/file.h>
 #include <linux/uio.h>
+#include <linux/aio.h>
 #include <linux/fsnotify.h>
 #include <linux/security.h>
 #include <linux/export.h>
@@ -329,16 +330,6 @@ int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count
        return count > MAX_RW_COUNT ? MAX_RW_COUNT : count;
 }
 
-static void wait_on_retry_sync_kiocb(struct kiocb *iocb)
-{
-       set_current_state(TASK_UNINTERRUPTIBLE);
-       if (!kiocbIsKicked(iocb))
-               schedule();
-       else
-               kiocbClearKicked(iocb);
-       __set_current_state(TASK_RUNNING);
-}
-
 ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
 {
        struct iovec iov = { .iov_base = buf, .iov_len = len };
@@ -350,13 +341,7 @@ ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *pp
        kiocb.ki_left = len;
        kiocb.ki_nbytes = len;
 
-       for (;;) {
-               ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
-               if (ret != -EIOCBRETRY)
-                       break;
-               wait_on_retry_sync_kiocb(&kiocb);
-       }
-
+       ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
        if (-EIOCBQUEUED == ret)
                ret = wait_on_sync_kiocb(&kiocb);
        *ppos = kiocb.ki_pos;
@@ -406,13 +391,7 @@ ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, lof
        kiocb.ki_left = len;
        kiocb.ki_nbytes = len;
 
-       for (;;) {
-               ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
-               if (ret != -EIOCBRETRY)
-                       break;
-               wait_on_retry_sync_kiocb(&kiocb);
-       }
-
+       ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
        if (-EIOCBQUEUED == ret)
                ret = wait_on_sync_kiocb(&kiocb);
        *ppos = kiocb.ki_pos;
@@ -592,13 +571,7 @@ static ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov,
        kiocb.ki_left = len;
        kiocb.ki_nbytes = len;
 
-       for (;;) {
-               ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos);
-               if (ret != -EIOCBRETRY)
-                       break;
-               wait_on_retry_sync_kiocb(&kiocb);
-       }
-
+       ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos);
        if (ret == -EIOCBQUEUED)
                ret = wait_on_sync_kiocb(&kiocb);
        *ppos = kiocb.ki_pos;
@@ -1091,6 +1064,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
        struct fd in, out;
        struct inode *in_inode, *out_inode;
        loff_t pos;
+       loff_t out_pos;
        ssize_t retval;
        int fl;
 
@@ -1104,12 +1078,14 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
        if (!(in.file->f_mode & FMODE_READ))
                goto fput_in;
        retval = -ESPIPE;
-       if (!ppos)
-               ppos = &in.file->f_pos;
-       else
+       if (!ppos) {
+               pos = in.file->f_pos;
+       } else {
+               pos = *ppos;
                if (!(in.file->f_mode & FMODE_PREAD))
                        goto fput_in;
-       retval = rw_verify_area(READ, in.file, ppos, count);
+       }
+       retval = rw_verify_area(READ, in.file, &pos, count);
        if (retval < 0)
                goto fput_in;
        count = retval;
@@ -1126,7 +1102,8 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
        retval = -EINVAL;
        in_inode = file_inode(in.file);
        out_inode = file_inode(out.file);
-       retval = rw_verify_area(WRITE, out.file, &out.file->f_pos, count);
+       out_pos = out.file->f_pos;
+       retval = rw_verify_area(WRITE, out.file, &out_pos, count);
        if (retval < 0)
                goto fput_out;
        count = retval;
@@ -1134,7 +1111,6 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
        if (!max)
                max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);
 
-       pos = *ppos;
        if (unlikely(pos + count > max)) {
                retval = -EOVERFLOW;
                if (pos >= max)
@@ -1153,18 +1129,23 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
        if (in.file->f_flags & O_NONBLOCK)
                fl = SPLICE_F_NONBLOCK;
 #endif
-       retval = do_splice_direct(in.file, ppos, out.file, count, fl);
+       retval = do_splice_direct(in.file, &pos, out.file, &out_pos, count, fl);
 
        if (retval > 0) {
                add_rchar(current, retval);
                add_wchar(current, retval);
                fsnotify_access(in.file);
                fsnotify_modify(out.file);
+               out.file->f_pos = out_pos;
+               if (ppos)
+                       *ppos = pos;
+               else
+                       in.file->f_pos = pos;
        }
 
        inc_syscr(current);
        inc_syscw(current);
-       if (*ppos > max)
+       if (pos > max)
                retval = -EOVERFLOW;
 
 fput_out: