ide: convert to ->proc_fops

->read_proc, ->write_proc are going away, ->proc_fops should be used instead.

The only tricky place is IDENTIFY handling: if for some reason
taskfile_lib_get_identify() fails, buffer _is_ changed and at least
first byte is overwritten. Emulate old behaviour with returning
that first byte to userspace and reporting length=1 despite overall -E.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 365 insertions, 207 deletions

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index ad0ab0c0a493..b79ca419d8d9 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -30,6 +30,7 @@
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/timer.h>
+#include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/errno.h>
@@ -1389,19 +1390,30 @@ static sector_t ide_cdrom_capacity(ide_drive_t *drive)
         return capacity * sectors_per_frame;
 }
 
-static int proc_idecd_read_capacity(char *page, char **start, off_t off,
-                                        int count, int *eof, void *data)
+static int idecd_capacity_proc_show(struct seq_file *m, void *v)
 {
-        ide_drive_t *drive = data;
-        int len;
+        ide_drive_t *drive = m->private;
 
-        len = sprintf(page, "%llu\n", (long long)ide_cdrom_capacity(drive));
-        PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
+        seq_printf(m, "%llu\n", (long long)ide_cdrom_capacity(drive));
+        return 0;
+}
+
+static int idecd_capacity_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, idecd_capacity_proc_show, PDE(inode)->data);
 }
 
+static const struct file_operations idecd_capacity_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = idecd_capacity_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
 static ide_proc_entry_t idecd_proc[] = {
-        { "capacity", S_IFREG|S_IRUGO, proc_idecd_read_capacity, NULL },
-        { NULL, 0, NULL, NULL }
+        { "capacity", S_IFREG|S_IRUGO, &idecd_capacity_proc_fops },
+        {}
 };
 
 static ide_proc_entry_t *ide_cd_proc_entries(ide_drive_t *drive)
diff --git a/drivers/ide/ide-disk_proc.c b/drivers/ide/ide-disk_proc.c
index 19f263bf0a9e..60b0590ccc9c 100644
--- a/drivers/ide/ide-disk_proc.c
+++ b/drivers/ide/ide-disk_proc.c
@@ -1,5 +1,6 @@
 #include <linux/kernel.h>
 #include <linux/ide.h>
+#include <linux/seq_file.h>
 
 #include "ide-disk.h"
 
@@ -37,77 +38,117 @@ static int get_smart_data(ide_drive_t *drive, u8 *buf, u8 sub_cmd)
         return ide_raw_taskfile(drive, &cmd, buf, 1);
 }
 
-static int proc_idedisk_read_cache
-        (char *page, char **start, off_t off, int count, int *eof, void *data)
+static int idedisk_cache_proc_show(struct seq_file *m, void *v)
 {
-        ide_drive_t     *drive = (ide_drive_t *) data;
-        char            *out = page;
-        int             len;
+        ide_drive_t     *drive = (ide_drive_t *) m->private;
 
         if (drive->dev_flags & IDE_DFLAG_ID_READ)
-                len = sprintf(out, "%i\n", drive->id[ATA_ID_BUF_SIZE] / 2);
+                seq_printf(m, "%i\n", drive->id[ATA_ID_BUF_SIZE] / 2);
         else
-                len = sprintf(out, "(none)\n");
+                seq_printf(m, "(none)\n");
+        return 0;
+}
 
-        PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
+static int idedisk_cache_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, idedisk_cache_proc_show, PDE(inode)->data);
 }
 
-static int proc_idedisk_read_capacity
-        (char *page, char **start, off_t off, int count, int *eof, void *data)
+static const struct file_operations idedisk_cache_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = idedisk_cache_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int idedisk_capacity_proc_show(struct seq_file *m, void *v)
 {
-        ide_drive_t*drive = (ide_drive_t *)data;
-        int len;
+        ide_drive_t*drive = (ide_drive_t *)m->private;
 
-        len = sprintf(page, "%llu\n", (long long)ide_gd_capacity(drive));
+        seq_printf(m, "%llu\n", (long long)ide_gd_capacity(drive));
+        return 0;
+}
 
-        PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
+static int idedisk_capacity_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, idedisk_capacity_proc_show, PDE(inode)->data);
 }
 
-static int proc_idedisk_read_smart(char *page, char **start, off_t off,
-                                   int count, int *eof, void *data, u8 sub_cmd)
+static const struct file_operations idedisk_capacity_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = idedisk_capacity_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int __idedisk_proc_show(struct seq_file *m, ide_drive_t *drive, u8 sub_cmd)
 {
-        ide_drive_t     *drive = (ide_drive_t *)data;
-        int             len = 0, i = 0;
+        u8 *buf;
+
+        buf = kmalloc(SECTOR_SIZE, GFP_KERNEL);
+        if (!buf)
+                return -ENOMEM;
 
         (void)smart_enable(drive);
 
-        if (get_smart_data(drive, page, sub_cmd) == 0) {
-                unsigned short *val = (unsigned short *) page;
-                char *out = (char *)val + SECTOR_SIZE;
-
-                page = out;
-                do {
-                        out += sprintf(out, "%04x%c", le16_to_cpu(*val),
-                                       (++i & 7) ? ' ' : '\n');
-                        val += 1;
-                } while (i < SECTOR_SIZE / 2);
-                len = out - page;
+        if (get_smart_data(drive, buf, sub_cmd) == 0) {
+                __le16 *val = (__le16 *)buf;
+                int i;
+
+                for (i = 0; i < SECTOR_SIZE / 2; i++) {
+                        seq_printf(m, "%04x%c", le16_to_cpu(val[i]),
+                                        (i % 8) == 7 ? '\n' : ' ');
+                }
         }
+        kfree(buf);
+        return 0;
+}
 
-        PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
+static int idedisk_sv_proc_show(struct seq_file *m, void *v)
+{
+        return __idedisk_proc_show(m, m->private, ATA_SMART_READ_VALUES);
 }
 
-static int proc_idedisk_read_sv
-        (char *page, char **start, off_t off, int count, int *eof, void *data)
+static int idedisk_sv_proc_open(struct inode *inode, struct file *file)
 {
-        return proc_idedisk_read_smart(page, start, off, count, eof, data,
-                                       ATA_SMART_READ_VALUES);
+        return single_open(file, idedisk_sv_proc_show, PDE(inode)->data);
 }
 
-static int proc_idedisk_read_st
-        (char *page, char **start, off_t off, int count, int *eof, void *data)
+static const struct file_operations idedisk_sv_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = idedisk_sv_proc_open,