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Diffstat (limited to 'fs/adfs/inode.c')
-rw-r--r--fs/adfs/inode.c90
1 files changed, 36 insertions, 54 deletions
diff --git a/fs/adfs/inode.c b/fs/adfs/inode.c
index 65794b8fe79..b9acadafa4a 100644
--- a/fs/adfs/inode.c
+++ b/fs/adfs/inode.c
@@ -7,7 +7,6 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
-#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include "adfs.h"
@@ -46,6 +45,14 @@ static int adfs_readpage(struct file *file, struct page *page)
return block_read_full_page(page, adfs_get_block);
}
+static void adfs_write_failed(struct address_space *mapping, loff_t to)
+{
+ struct inode *inode = mapping->host;
+
+ if (to > inode->i_size)
+ truncate_pagecache(inode, inode->i_size);
+}
+
static int adfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
@@ -56,11 +63,8 @@ static int adfs_write_begin(struct file *file, struct address_space *mapping,
ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
adfs_get_block,
&ADFS_I(mapping->host)->mmu_private);
- if (unlikely(ret)) {
- loff_t isize = mapping->host->i_size;
- if (pos + len > isize)
- vmtruncate(mapping->host, isize);
- }
+ if (unlikely(ret))
+ adfs_write_failed(mapping, pos + len);
return ret;
}
@@ -73,32 +77,18 @@ static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
static const struct address_space_operations adfs_aops = {
.readpage = adfs_readpage,
.writepage = adfs_writepage,
- .sync_page = block_sync_page,
.write_begin = adfs_write_begin,
.write_end = generic_write_end,
.bmap = _adfs_bmap
};
-static inline unsigned int
-adfs_filetype(struct inode *inode)
-{
- unsigned int type;
-
- if (ADFS_I(inode)->stamped)
- type = (ADFS_I(inode)->loadaddr >> 8) & 0xfff;
- else
- type = (unsigned int) -1;
-
- return type;
-}
-
/*
* Convert ADFS attributes and filetype to Linux permission.
*/
static umode_t
adfs_atts2mode(struct super_block *sb, struct inode *inode)
{
- unsigned int filetype, attr = ADFS_I(inode)->attr;
+ unsigned int attr = ADFS_I(inode)->attr;
umode_t mode, rmask;
struct adfs_sb_info *asb = ADFS_SB(sb);
@@ -107,9 +97,7 @@ adfs_atts2mode(struct super_block *sb, struct inode *inode)
return S_IFDIR | S_IXUGO | mode;
}
- filetype = adfs_filetype(inode);
-
- switch (filetype) {
+ switch (ADFS_I(inode)->filetype) {
case 0xfc0: /* LinkFS */
return S_IFLNK|S_IRWXUGO;
@@ -175,50 +163,48 @@ adfs_mode2atts(struct super_block *sb, struct inode *inode)
/*
* Convert an ADFS time to Unix time. ADFS has a 40-bit centi-second time
- * referenced to 1 Jan 1900 (til 2248)
+ * referenced to 1 Jan 1900 (til 2248) so we need to discard 2208988800 seconds
+ * of time to convert from RISC OS epoch to Unix epoch.
*/
static void
adfs_adfs2unix_time(struct timespec *tv, struct inode *inode)
{
unsigned int high, low;
+ /* 01 Jan 1970 00:00:00 (Unix epoch) as nanoseconds since
+ * 01 Jan 1900 00:00:00 (RISC OS epoch)
+ */
+ static const s64 nsec_unix_epoch_diff_risc_os_epoch =
+ 2208988800000000000LL;
+ s64 nsec;
if (ADFS_I(inode)->stamped == 0)
goto cur_time;
- high = ADFS_I(inode)->loadaddr << 24;
- low = ADFS_I(inode)->execaddr;
+ high = ADFS_I(inode)->loadaddr & 0xFF; /* top 8 bits of timestamp */
+ low = ADFS_I(inode)->execaddr; /* bottom 32 bits of timestamp */
- high |= low >> 8;
- low &= 255;
+ /* convert 40-bit centi-seconds to 32-bit seconds
+ * going via nanoseconds to retain precision
+ */
+ nsec = (((s64) high << 32) | (s64) low) * 10000000; /* cs to ns */
/* Files dated pre 01 Jan 1970 00:00:00. */
- if (high < 0x336e996a)
+ if (nsec < nsec_unix_epoch_diff_risc_os_epoch)
goto too_early;
- /* Files dated post 18 Jan 2038 03:14:05. */
- if (high >= 0x656e9969)
- goto too_late;
+ /* convert from RISC OS to Unix epoch */
+ nsec -= nsec_unix_epoch_diff_risc_os_epoch;
- /* discard 2208988800 (0x336e996a00) seconds of time */
- high -= 0x336e996a;
-
- /* convert 40-bit centi-seconds to 32-bit seconds */
- tv->tv_sec = (((high % 100) << 8) + low) / 100 + (high / 100 << 8);
- tv->tv_nsec = 0;
+ *tv = ns_to_timespec(nsec);
return;
cur_time:
- *tv = CURRENT_TIME_SEC;
+ *tv = CURRENT_TIME;
return;
too_early:
tv->tv_sec = tv->tv_nsec = 0;
return;
-
- too_late:
- tv->tv_sec = 0x7ffffffd;
- tv->tv_nsec = 0;
- return;
}
/*
@@ -266,7 +252,7 @@ adfs_iget(struct super_block *sb, struct object_info *obj)
inode->i_gid = ADFS_SB(sb)->s_gid;
inode->i_ino = obj->file_id;
inode->i_size = obj->size;
- inode->i_nlink = 2;
+ set_nlink(inode, 2);
inode->i_blocks = (inode->i_size + sb->s_blocksize - 1) >>
sb->s_blocksize_bits;
@@ -280,7 +266,8 @@ adfs_iget(struct super_block *sb, struct object_info *obj)
ADFS_I(inode)->loadaddr = obj->loadaddr;
ADFS_I(inode)->execaddr = obj->execaddr;
ADFS_I(inode)->attr = obj->attr;
- ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000);
+ ADFS_I(inode)->filetype = obj->filetype;
+ ADFS_I(inode)->stamped = ((obj->loadaddr & 0xfff00000) == 0xfff00000);
inode->i_mode = adfs_atts2mode(sb, inode);
adfs_adfs2unix_time(&inode->i_mtime, inode);
@@ -316,16 +303,14 @@ adfs_notify_change(struct dentry *dentry, struct iattr *attr)
unsigned int ia_valid = attr->ia_valid;
int error;
- lock_kernel();
-
error = inode_change_ok(inode, attr);
/*
* we can't change the UID or GID of any file -
* we have a global UID/GID in the superblock
*/
- if ((ia_valid & ATTR_UID && attr->ia_uid != ADFS_SB(sb)->s_uid) ||
- (ia_valid & ATTR_GID && attr->ia_gid != ADFS_SB(sb)->s_gid))
+ if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, ADFS_SB(sb)->s_uid)) ||
+ (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, ADFS_SB(sb)->s_gid)))
error = -EPERM;
if (error)
@@ -359,7 +344,6 @@ adfs_notify_change(struct dentry *dentry, struct iattr *attr)
if (ia_valid & (ATTR_SIZE | ATTR_MTIME | ATTR_MODE))
mark_inode_dirty(inode);
out:
- unlock_kernel();
return error;
}
@@ -374,7 +358,6 @@ int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
struct object_info obj;
int ret;
- lock_kernel();
obj.file_id = inode->i_ino;
obj.name_len = 0;
obj.parent_id = ADFS_I(inode)->parent_id;
@@ -384,6 +367,5 @@ int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
obj.size = inode->i_size;
ret = adfs_dir_update(sb, &obj, wbc->sync_mode == WB_SYNC_ALL);
- unlock_kernel();
return ret;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 12:55:33 +0000