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Diffstat (limited to 'fs/xfs/linux-2.6/xfs_file.c')
-rw-r--r--fs/xfs/linux-2.6/xfs_file.c854
1 files changed, 805 insertions, 49 deletions
diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index e4caeb28ce2..42dd3bcfba6 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -16,6 +16,7 @@
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
+#include "xfs_fs.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
@@ -34,52 +35,279 @@
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
+#include "xfs_inode_item.h"
+#include "xfs_bmap.h"
#include "xfs_error.h"
#include "xfs_rw.h"
#include "xfs_vnodeops.h"
#include "xfs_da_btree.h"
#include "xfs_ioctl.h"
+#include "xfs_trace.h"
#include <linux/dcache.h>
static const struct vm_operations_struct xfs_file_vm_ops;
-STATIC ssize_t
-xfs_file_aio_read(
- struct kiocb *iocb,
- const struct iovec *iov,
- unsigned long nr_segs,
- loff_t pos)
+/*
+ * xfs_iozero
+ *
+ * xfs_iozero clears the specified range of buffer supplied,
+ * and marks all the affected blocks as valid and modified. If
+ * an affected block is not allocated, it will be allocated. If
+ * an affected block is not completely overwritten, and is not
+ * valid before the operation, it will be read from disk before
+ * being partially zeroed.
+ */
+STATIC int
+xfs_iozero(
+ struct xfs_inode *ip, /* inode */
+ loff_t pos, /* offset in file */
+ size_t count) /* size of data to zero */
{
- struct file *file = iocb->ki_filp;
- int ioflags = 0;
+ struct page *page;
+ struct address_space *mapping;
+ int status;
- BUG_ON(iocb->ki_pos != pos);
- if (unlikely(file->f_flags & O_DIRECT))
- ioflags |= IO_ISDIRECT;
- if (file->f_mode & FMODE_NOCMTIME)
- ioflags |= IO_INVIS;
- return xfs_read(XFS_I(file->f_path.dentry->d_inode), iocb, iov,
- nr_segs, &iocb->ki_pos, ioflags);
+ mapping = VFS_I(ip)->i_mapping;
+ do {
+ unsigned offset, bytes;
+ void *fsdata;
+
+ offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
+ bytes = PAGE_CACHE_SIZE - offset;
+ if (bytes > count)
+ bytes = count;
+
+ status = pagecache_write_begin(NULL, mapping, pos, bytes,
+ AOP_FLAG_UNINTERRUPTIBLE,
+ &page, &fsdata);
+ if (status)
+ break;
+
+ zero_user(page, offset, bytes);
+
+ status = pagecache_write_end(NULL, mapping, pos, bytes, bytes,
+ page, fsdata);
+ WARN_ON(status <= 0); /* can't return less than zero! */
+ pos += bytes;
+ count -= bytes;
+ status = 0;
+ } while (count);
+
+ return (-status);
+}
+
+STATIC int
+xfs_file_fsync(
+ struct file *file,
+ struct dentry *dentry,
+ int datasync)
+{
+ struct xfs_inode *ip = XFS_I(dentry->d_inode);
+ struct xfs_trans *tp;
+ int error = 0;
+ int log_flushed = 0;
+
+ xfs_itrace_entry(ip);
+
+ if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+ return -XFS_ERROR(EIO);
+
+ xfs_iflags_clear(ip, XFS_ITRUNCATED);
+
+ /*
+ * We always need to make sure that the required inode state is safe on
+ * disk. The inode might be clean but we still might need to force the
+ * log because of committed transactions that haven't hit the disk yet.
+ * Likewise, there could be unflushed non-transactional changes to the
+ * inode core that have to go to disk and this requires us to issue
+ * a synchronous transaction to capture these changes correctly.
+ *
+ * This code relies on the assumption that if the i_update_core field
+ * of the inode is clear and the inode is unpinned then it is clean
+ * and no action is required.
+ */
+ xfs_ilock(ip, XFS_ILOCK_SHARED);
+
+ /*
+ * First check if the VFS inode is marked dirty. All the dirtying
+ * of non-transactional updates no goes through mark_inode_dirty*,
+ * which allows us to distinguish beteeen pure timestamp updates
+ * and i_size updates which need to be caught for fdatasync.
+ * After that also theck for the dirty state in the XFS inode, which
+ * might gets cleared when the inode gets written out via the AIL
+ * or xfs_iflush_cluster.
+ */
+ if (((dentry->d_inode->i_state & I_DIRTY_DATASYNC) ||
+ ((dentry->d_inode->i_state & I_DIRTY_SYNC) && !datasync)) &&
+ ip->i_update_core) {
+ /*
+ * Kick off a transaction to log the inode core to get the
+ * updates. The sync transaction will also force the log.
+ */
+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
+ tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS);
+ error = xfs_trans_reserve(tp, 0,
+ XFS_FSYNC_TS_LOG_RES(ip->i_mount), 0, 0, 0);
+ if (error) {
+ xfs_trans_cancel(tp, 0);
+ return -error;
+ }
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+
+ /*
+ * Note - it's possible that we might have pushed ourselves out
+ * of the way during trans_reserve which would flush the inode.
+ * But there's no guarantee that the inode buffer has actually
+ * gone out yet (it's delwri). Plus the buffer could be pinned
+ * anyway if it's part of an inode in another recent
+ * transaction. So we play it safe and fire off the
+ * transaction anyway.
+ */
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+ xfs_trans_ihold(tp, ip);
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ xfs_trans_set_sync(tp);
+ error = _xfs_trans_commit(tp, 0, &log_flushed);
+
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ } else {
+ /*
+ * Timestamps/size haven't changed since last inode flush or
+ * inode transaction commit. That means either nothing got
+ * written or a transaction committed which caught the updates.
+ * If the latter happened and the transaction hasn't hit the
+ * disk yet, the inode will be still be pinned. If it is,
+ * force the log.
+ */
+ if (xfs_ipincount(ip)) {
+ error = _xfs_log_force_lsn(ip->i_mount,
+ ip->i_itemp->ili_last_lsn,
+ XFS_LOG_SYNC, &log_flushed);
+ }
+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
+ }
+
+ if (ip->i_mount->m_flags & XFS_MOUNT_BARRIER) {
+ /*
+ * If the log write didn't issue an ordered tag we need
+ * to flush the disk cache for the data device now.
+ */
+ if (!log_flushed)
+ xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp);
+
+ /*
+ * If this inode is on the RT dev we need to flush that
+ * cache as well.
+ */
+ if (XFS_IS_REALTIME_INODE(ip))
+ xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
+ }
+
+ return -error;
}
STATIC ssize_t
-xfs_file_aio_write(
+xfs_file_aio_read(
struct kiocb *iocb,
- const struct iovec *iov,
+ const struct iovec *iovp,
unsigned long nr_segs,
loff_t pos)
{
struct file *file = iocb->ki_filp;
+ struct inode *inode = file->f_mapping->host;
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ size_t size = 0;
+ ssize_t ret = 0;
int ioflags = 0;
+ xfs_fsize_t n;
+ unsigned long seg;
+
+ XFS_STATS_INC(xs_read_calls);
BUG_ON(iocb->ki_pos != pos);
+
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
if (file->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
- return xfs_write(XFS_I(file->f_mapping->host), iocb, iov, nr_segs,
- &iocb->ki_pos, ioflags);
+
+ /* START copy & waste from filemap.c */
+ for (seg = 0; seg < nr_segs; seg++) {
+ const struct iovec *iv = &iovp[seg];
+
+ /*
+ * If any segment has a negative length, or the cumulative
+ * length ever wraps negative then return -EINVAL.
+ */
+ size += iv->iov_len;
+ if (unlikely((ssize_t)(size|iv->iov_len) < 0))
+ return XFS_ERROR(-EINVAL);
+ }
+ /* END copy & waste from filemap.c */
+
+ if (unlikely(ioflags & IO_ISDIRECT)) {
+ xfs_buftarg_t *target =
+ XFS_IS_REALTIME_INODE(ip) ?
+ mp->m_rtdev_targp : mp->m_ddev_targp;
+ if ((iocb->ki_pos & target->bt_smask) ||
+ (size & target->bt_smask)) {
+ if (iocb->ki_pos == ip->i_size)
+ return 0;
+ return -XFS_ERROR(EINVAL);
+ }
+ }
+
+ n = XFS_MAXIOFFSET(mp) - iocb->ki_pos;
+ if (n <= 0 || size == 0)
+ return 0;
+
+ if (n < size)
+ size = n;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ if (unlikely(ioflags & IO_ISDIRECT))
+ mutex_lock(&inode->i_mutex);
+ xfs_ilock(ip, XFS_IOLOCK_SHARED);
+
+ if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
+ int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags);
+ int iolock = XFS_IOLOCK_SHARED;
+
+ ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, iocb->ki_pos, size,
+ dmflags, &iolock);
+ if (ret) {
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+ if (unlikely(ioflags & IO_ISDIRECT))
+ mutex_unlock(&inode->i_mutex);
+ return ret;
+ }
+ }
+
+ if (unlikely(ioflags & IO_ISDIRECT)) {
+ if (inode->i_mapping->nrpages) {
+ ret = -xfs_flushinval_pages(ip,
+ (iocb->ki_pos & PAGE_CACHE_MASK),
+ -1, FI_REMAPF_LOCKED);
+ }
+ mutex_unlock(&inode->i_mutex);
+ if (ret) {
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+ return ret;
+ }
+ }
+
+ trace_xfs_file_read(ip, size, iocb->ki_pos, ioflags);
+
+ ret = generic_file_aio_read(iocb, iovp, nr_segs, iocb->ki_pos);
+ if (ret > 0)
+ XFS_STATS_ADD(xs_read_bytes, ret);
+
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+ return ret;
}
STATIC ssize_t
@@ -87,16 +315,44 @@ xfs_file_splice_read(
struct file *infilp,
loff_t *ppos,
struct pipe_inode_info *pipe,
- size_t len,
+ size_t count,
unsigned int flags)
{
+ struct xfs_inode *ip = XFS_I(infilp->f_mapping->host);
+ struct xfs_mount *mp = ip->i_mount;
int ioflags = 0;
+ ssize_t ret;
+
+ XFS_STATS_INC(xs_read_calls);
if (infilp->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
- return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
- infilp, ppos, pipe, len, flags, ioflags);
+ if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+ return -EIO;
+
+ xfs_ilock(ip, XFS_IOLOCK_SHARED);
+
+ if (DM_EVENT_ENABLED(ip, DM_EVENT_READ) && !(ioflags & IO_INVIS)) {
+ int iolock = XFS_IOLOCK_SHARED;
+ int error;
+
+ error = XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *ppos, count,
+ FILP_DELAY_FLAG(infilp), &iolock);
+ if (error) {
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+ return -error;
+ }
+ }
+
+ trace_xfs_file_splice_read(ip, count, *ppos, ioflags);
+
+ ret = generic_file_splice_read(infilp, ppos, pipe, count, flags);
+ if (ret > 0)
+ XFS_STATS_ADD(xs_read_bytes, ret);
+
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+ return ret;
}
STATIC ssize_t
@@ -104,16 +360,538 @@ xfs_file_splice_write(
struct pipe_inode_info *pipe,
struct file *outfilp,
loff_t *ppos,
- size_t len,
+ size_t count,
unsigned int flags)
{
+ struct inode *inode = outfilp->f_mapping->host;
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fsize_t isize, new_size;
int ioflags = 0;
+ ssize_t ret;
+
+ XFS_STATS_INC(xs_write_calls);
if (outfilp->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
- return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
- pipe, outfilp, ppos, len, flags, ioflags);
+ if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+ return -EIO;
+
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
+
+ if (DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) && !(ioflags & IO_INVIS)) {
+ int iolock = XFS_IOLOCK_EXCL;
+ int error;
+
+ error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, *ppos, count,
+ FILP_DELAY_FLAG(outfilp), &iolock);
+ if (error) {
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ return -error;
+ }
+ }
+
+ new_size = *ppos + count;
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ if (new_size > ip->i_size)
+ ip->i_new_size = new_size;
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+ trace_xfs_file_splice_write(ip, count, *ppos, ioflags);
+
+ ret = generic_file_splice_write(pipe, outfilp, ppos, count, flags);
+ if (ret > 0)
+ XFS_STATS_ADD(xs_write_bytes, ret);
+
+ isize = i_size_read(inode);
+ if (unlikely(ret < 0 && ret != -EFAULT && *ppos > isize))
+ *ppos = isize;
+
+ if (*ppos > ip->i_size) {
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ if (*ppos > ip->i_size)
+ ip->i_size = *ppos;
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ }
+
+ if (ip->i_new_size) {
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ ip->i_new_size = 0;
+ if (ip->i_d.di_size > ip->i_size)
+ ip->i_d.di_size = ip->i_size;
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ }
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ return ret;
+}
+
+/*
+ * This routine is called to handle zeroing any space in the last
+ * block of the file that is beyond the EOF. We do this since the
+ * size is being increased without writing anything to that block
+ * and we don't want anyone to read the garbage on the disk.
+ */
+STATIC int /* error (positive) */
+xfs_zero_last_block(
+ xfs_inode_t *ip,
+ xfs_fsize_t offset,
+ xfs_fsize_t isize)
+{
+ xfs_fileoff_t last_fsb;
+ xfs_mount_t *mp = ip->i_mount;
+ int nimaps;
+ int zero_offset;
+ int zero_len;
+ int error = 0;
+ xfs_bmbt_irec_t imap;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+
+ zero_offset = XFS_B_FSB_OFFSET(mp, isize);
+ if (zero_offset == 0) {
+ /*
+ * There are no extra bytes in the last block on disk to
+ * zero, so return.
+ */
+ return 0;
+ }
+
+ last_fsb = XFS_B_TO_FSBT(mp, isize);
+ nimaps = 1;
+ error = xfs_bmapi(NULL, ip, last_fsb, 1, 0, NULL, 0, &imap,
+ &nimaps, NULL, NULL);
+ if (error) {
+ return error;
+ }
+ ASSERT(nimaps > 0);
+ /*
+ * If the block underlying isize is just a hole, then there
+ * is nothing to zero.
+ */
+ if (imap.br_startblock == HOLESTARTBLOCK) {
+ return 0;
+ }
+ /*
+ * Zero the part of the last block beyond the EOF, and write it
+ * out sync. We need to drop the ilock while we do this so we
+ * don't deadlock when the buffer cache calls back to us.
+ */
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+ zero_len = mp->m_sb.sb_blocksize - zero_offset;
+ if (isize + zero_len > offset)
+ zero_len = offset - isize;
+ error = xfs_iozero(ip, isize, zero_len);
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ ASSERT(error >= 0);
+ return error;
+}
+
+/*
+ * Zero any on disk space between the current EOF and the new,
+ * larger EOF. This handles the normal case of zeroing the remainder
+ * of the last block in the file and the unusual case of zeroing blocks
+ * out beyond the size of the file. This second case only happens
+ * with fixed size extents and when the system crashes before the inode
+ * size was updated but after blocks were allocated. If fill is set,
+ * then any holes in the range are filled and zeroed. If not, the holes
+ * are left alone as holes.
+ */
+
+int /* error (positive) */
+xfs_zero_eof(
+ xfs_inode_t *ip,
+ xfs_off_t offset, /* starting I/O offset */
+ xfs_fsize_t isize) /* current inode size */
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_fileoff_t start_zero_fsb;
+ xfs_fileoff_t end_zero_fsb;
+ xfs_fileoff_t zero_count_fsb;
+ xfs_fileoff_t last_fsb;
+ xfs_fileoff_t zero_off;
+ xfs_fsize_t zero_len;
+ int nimaps;
+ int error = 0;
+ xfs_bmbt_irec_t imap;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
+ ASSERT(offset > isize);
+
+ /*
+ * First handle zeroing the block on which isize resides.
+ * We only zero a part of that block so it is handled specially.
+ */
+ error = xfs_zero_last_block(ip, offset, isize);
+ if (error) {
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
+ return error;
+ }
+
+ /*
+ * Calculate the range between the new size and the old
+ * where blocks needing to be zeroed may exist. To get the
+ * block where the last byte in the file currently resides,
+ * we need to subtract one from the size and truncate back
+ * to a block boundary. We subtract 1 in case the size is
+ * exactly on a block boundary.
+ */
+ last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
+ start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
+ end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
+ ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
+ if (last_fsb == end_zero_fsb) {
+ /*
+ * The size was only incremented on its last block.
+ * We took care of that above, so just return.
+ */
+ return 0;
+ }
+
+ ASSERT(start_zero_fsb <= end_zero_fsb);
+ while (start_zero_fsb <= end_zero_fsb) {
+ nimaps = 1;
+ zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
+ error = xfs_bmapi(NULL, ip, start_zero_fsb, zero_count_fsb,
+ 0, NULL, 0, &imap, &nimaps, NULL, NULL);
+ if (error) {
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
+ return error;
+ }
+ ASSERT(nimaps > 0);
+
+ if (imap.br_state == XFS_EXT_UNWRITTEN ||
+ imap.br_startblock == HOLESTARTBLOCK) {
+ /*
+ * This loop handles initializing pages that were
+ * partially initialized by the code below this
+ * loop. It basically zeroes the part of the page
+ * that sits on a hole and sets the page as P_HOLE
+ * and calls remapf if it is a mapped file.
+ */
+ start_zero_fsb = imap.br_startoff + imap.br_blockcount;
+ ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
+ continue;
+ }
+
+ /*
+ * There are blocks we need to zero.
+ * Drop the inode lock while we're doing the I/O.
+ * We'll still have the iolock to protect us.
+ */
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+ zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
+ zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);
+
+ if ((zero_off + zero_len) > offset)
+ zero_len = offset - zero_off;
+
+ error = xfs_iozero(ip, zero_off, zero_len);
+ if (error) {
+ goto out_lock;
+ }
+
+ start_zero_fsb = imap.br_startoff + imap.br_blockcount;
+ ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ }
+
+ return 0;
+
+out_lock:
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ ASSERT(error >= 0);
+ return error;
+}
+
+STATIC ssize_t
+xfs_file_aio_write(
+ struct kiocb *iocb,
+ const struct iovec *iovp,
+ unsigned long nr_segs,
+ loff_t pos)
+{
+ struct file *file = iocb->ki_filp;
+ struct address_space *mapping = file->f_mapping;
+ struct inode *inode = mapping->host;
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ ssize_t ret = 0, error = 0;
+ int ioflags = 0;
+ xfs_fsize_t isize, new_size;
+ int iolock;
+ int eventsent = 0;
+ size_t ocount = 0, count;
+ int need_i_mutex;
+
+ XFS_STATS_INC(xs_write_calls);
+
+ BUG_ON(iocb->ki_pos != pos);
+
+ if (unlikely(file->f_flags & O_DIRECT))
+ ioflags |= IO_ISDIRECT;
+ if (file->f_mode & FMODE_NOCMTIME)
+ ioflags |= IO_INVIS;
+
+ error = generic_segment_checks(iovp, &nr_segs, &ocount, VERIFY_READ);
+ if (error)
+ return error;
+
+ count = ocount;
+ if (count == 0)
+ return 0;
+
+ xfs_wait_for_freeze(mp, SB_FREEZE_WRITE);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+relock:
+ if (ioflags & IO_ISDIRECT) {
+ iolock = XFS_IOLOCK_SHARED;
+ need_i_mutex = 0;
+ } else {
+ iolock = XFS_IOLOCK_EXCL;
+ need_i_mutex = 1;
+ mutex_lock(&inode->i_mutex);
+ }
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL|iolock);
+
+start:
+ error = -generic_write_checks(file, &pos, &count,
+ S_ISBLK(inode->i_mode));
+ if (error) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
+ goto out_unlock_mutex;
+ }
+
+ if ((DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) &&
+ !(ioflags & IO_INVIS) && !eventsent)) {
+ int dmflags = FILP_DELAY_FLAG(file);
+
+ if (need_i_mutex)
+ dmflags |= DM_FLAGS_IMUX;
+
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ error = XFS_SEND_DATA(ip->i_mount, DM_EVENT_WRITE, ip,
+ pos, count, dmflags, &iolock);
+ if (error) {
+ goto out_unlock_internal;
+ }
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ eventsent = 1;
+
+ /*
+ * The iolock was dropped and reacquired in XFS_SEND_DATA
+ * so we have to recheck the size when appending.
+ * We will only "goto start;" once, since having sent the
+ * event prevents another call to XFS_SEND_DATA, which is
+ * what allows the size to change in the first place.
+ */
+ if ((file->f_flags & O_APPEND) && pos != ip->i_size)
+ goto start;
+ }
+
+ if (ioflags & IO_ISDIRECT) {
+ xfs_buftarg_t *target =
+ XFS_IS_REALTIME_INODE(ip) ?
+ mp->m_rtdev_targp : mp->m_ddev_targp;
+
+ if ((pos & target->bt_smask) || (count & target->bt_smask)) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
+ return XFS_ERROR(-EINVAL);
+ }
+
+ if (!need_i_mutex && (mapping->nrpages || pos > ip->i_size)) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
+ iolock = XFS_IOLOCK_EXCL;
+ need_i_mutex = 1;
+ mutex_lock(&inode->i_mutex);
+ xfs_ilock(ip, XFS_ILOCK_EXCL|iolock);
+ goto start;
+ }
+ }
+
+ new_size = pos + count;
+ if (new_size > ip->i_size)
+ ip->i_new_size = new_size;
+
+ if (likely(!(ioflags & IO_INVIS)))
+ file_update_time(file);
+
+ /*
+ * If the offset is beyond the size of the file, we have a couple
+ * of things to do. First, if there is already space allocated
+ * we need to either create holes or zero the disk or ...
+ *
+ * If there is a page where the previous size lands, we need
+ * to zero it out up to the new size.
+ */
+
+ if (pos > ip->i_size) {
+ error = xfs_zero_eof(ip, pos, ip->i_size);
+ if (error) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ goto out_unlock_internal;
+ }
+ }
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+ /*
+ * If we're writing the file then make sure to clear the
+ * setuid and setgid bits if the process is not being run
+ * by root. This keeps people from modifying setuid and
+ * setgid binaries.
+ */
+ error = -file_remove_suid(file);
+ if (unlikely(error))
+ goto out_unlock_internal;
+
+ /* We can write back this queue in page reclaim */
+ current->backing_dev_info = mapping->backing_dev_info;
+
+ if ((ioflags & IO_ISDIRECT)) {
+ if (mapping->nrpages) {
+ WARN_ON(need_i_mutex == 0);
+ error = xfs_flushinval_pages(ip,
+ (pos & PAGE_CACHE_MASK),
+ -1, FI_REMAPF_LOCKED);
+ if (error)
+ goto out_unlock_internal;
+ }
+
+ if (need_i_mutex) {
+ /* demote the lock now the cached pages are gone */
+ xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
+ mutex_unlock(&inode->i_mutex);
+
+ iolock = XFS_IOLOCK_SHARED;
+ need_i_mutex = 0;
+ }
+
+ trace_xfs_file_direct_write(ip, count, iocb->ki_pos, ioflags);
+ ret = generic_file_direct_write(iocb, iovp,
+ &nr_segs, pos, &iocb->ki_pos, count, ocount);
+
+ /*
+ * direct-io write to a hole: fall through to buffered I/O
+ * for completing the rest of the request.
+ */
+ if (ret >= 0 && ret != count) {
+ XFS_STATS_ADD(xs_write_bytes, ret);
+
+ pos += ret;
+ count -= ret;
+
+ ioflags &= ~IO_ISDIRECT;
+ xfs_iunlock(ip, iolock);
+ goto relock;
+ }
+ } else {
+ int enospc = 0;
+ ssize_t ret2 = 0;
+
+write_retry:
+ trace_xfs_file_buffered_write(ip, count, iocb->ki_pos, ioflags);
+ ret2 = generic_file_buffered_write(iocb, iovp, nr_segs,
+ pos, &iocb->ki_pos, count, ret);
+ /*
+ * if we just got an ENOSPC, flush the inode now we
+ * aren't holding any page locks and retry *once*
+ */
+ if (ret2 == -ENOSPC && !enospc) {
+ error = xfs_flush_pages(ip, 0, -1, 0, FI_NONE);
+ if (error)
+ goto out_unlock_internal;
+ enospc = 1;
+ goto write_retry;
+ }
+ ret = ret2;
+ }
+
+ current->backing_dev_info = NULL;
+
+ isize = i_size_read(inode);
+ if (unlikely(ret < 0 && ret != -EFAULT && iocb->ki_pos > isize))
+ iocb->ki_pos = isize;
+
+ if (iocb->ki_pos > ip->i_size) {
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ if (iocb->ki_pos > ip->i_size)
+ ip->i_size = iocb->ki_pos;
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ }
+
+ if (ret == -ENOSPC &&
+ DM_EVENT_ENABLED(ip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
+ xfs_iunlock(ip, iolock);
+ if (need_i_mutex)
+ mutex_unlock(&inode->i_mutex);
+ error = XFS_SEND_NAMESP(ip->i_mount, DM_EVENT_NOSPACE, ip,
+ DM_RIGHT_NULL, ip, DM_RIGHT_NULL, NULL, NULL,
+ 0, 0, 0); /* Delay flag intentionally unused */
+ if (need_i_mutex)
+ mutex_lock(&inode->i_mutex);
+ xfs_ilock(ip, iolock);
+ if (error)
+ goto out_unlock_internal;
+ goto start;
+ }
+
+ error = -ret;
+ if (ret <= 0)
+ goto out_unlock_internal;
+
+ XFS_STATS_ADD(xs_write_bytes, ret);
+
+ /* Handle various SYNC-type writes */
+ if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
+ loff_t end = pos + ret - 1;
+ int error2;
+
+ xfs_iunlock(ip, iolock);
+ if (need_i_mutex)
+ mutex_unlock(&inode->i_mutex);
+
+ error2 = filemap_write_and_wait_range(mapping, pos, end);
+ if (!error)
+ error = error2;
+ if (need_i_mutex)
+ mutex_lock(&inode->i_mutex);
+ xfs_ilock(ip, iolock);
+
+ error2 = -xfs_file_fsync(file, file->f_path.dentry,
+ (file->f_flags & __O_SYNC) ? 0 : 1);
+ if (!error)
+ error = error2;
+ }
+
+ out_unlock_internal:
+ if (ip->i_new_size) {
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ ip->i_new_size = 0;
+ /*
+ * If this was a direct or synchronous I/O that failed (such
+ * as ENOSPC) then part of the I/O may have been written to
+ * disk before the error occured. In this case the on-disk
+ * file size may have been adjusted beyond the in-memory file
+ * size and now needs to be truncated back.
+ */
+ if (ip->i_d.di_size > ip->i_size)
+ ip->i_d.di_size = ip->i_size;
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ }
+ xfs_iunlock(ip, iolock);
+ out_unlock_mutex:
+ if (need_i_mutex)
+ mutex_unlock(&inode->i_mutex);
+ return -error;
}
STATIC int
@@ -160,28 +938,6 @@ xfs_file_release(
return -xfs_release(XFS_I(inode));
}
-/*
- * We ignore the datasync flag here because a datasync is effectively
- * identical to an fsync. That is, datasync implies that we need to write
- * only the metadata needed to be able to access the data that is written
- * if we crash after the call completes. Hence if we are writing beyond
- * EOF we have to log the inode size change as well, which makes it a
- * full fsync. If we don't write beyond EOF, the inode core will be
- * clean in memory and so we don't need to log the inode, just like
- * fsync.
- */
-STATIC int
-xfs_file_fsync(
- struct file *file,
- struct dentry *dentry,
- int datasync)
-{
- struct xfs_inode *ip = XFS_I(dentry->d_inode);
-
- xfs_iflags_clear(ip, XFS_ITRUNCATED);
- return -xfs_fsync(ip);
-}
-
STATIC int
xfs_file_readdir(
struct file *filp,
@@ -203,9 +959,9 @@ xfs_file_readdir(
*
* Try to give it an estimate that's good enough, maybe at some
* point we can change the ->readdir prototype to include the
- * buffer size.
+ * buffer size. For now we use the current glibc buffer size.
*/
- bufsize = (size_t)min_t(loff_t, PAGE_SIZE, ip->i_d.di_size);
+ bufsize = (size_t)min_t(loff_t, 32768, ip->i_d.di_size);
error = xfs_readdir(ip, dirent, bufsize,
(xfs_off_t *)&filp->f_pos, filldir);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-27 15:47:39 +0000