Linux 3.11 compat: fops->iterate() #1653
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This looks good. |
Commit torvalds/linux@2233f31 replaced ->readdir() with ->iterate() in struct file_operations. All filesystems must now use the new ->iterate method. To handle this the code was reworked to use the new ->iterate interface. Care was taken to keep the majority of changes confined to the ZPL layer which is already Linux specific. However, minor changes were required to the common zfs_readdir() function. Compatibility with older kernels was accomplished by adding versions of the trivial dir_emit* helper functions. Also the various *_readdir() functions were reworked in to wrappers which create a dir_context structure to pass to the new *_iterate() functions. Unfortunately, the new dir_emit* functions prevent us from passing a private pointer to the filldir function. The xattr directory code leveraged this ability through zfs_readdir() to generate the list of xattr names. Since we can no longer use zfs_readdir() a simplified zpl_xattr_readdir() function was added to perform the same task. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
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@ryao I've refreshed the patch after discovering an issue with the xattr implementation for 3.11 kernels. We can no longer use zfs_readdir() there because we've lost the ability to pass a private data pointer to the filldir handler. I've reworked the code to address this and I like the results, it's simpler and should suffer from breakage if the kernel interfaces change again. |
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The refreshed patch now passed automated regression testing on all the builders. |
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@ryao Unless you have an outstanding concerns I'm going to merge this. It passed an entire evening of torture testing. |
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I have no concerns with this patch. |
unya
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Dec 13, 2013
Commit torvalds/linux@2233f31 replaced ->readdir() with ->iterate() in struct file_operations. All filesystems must now use the new ->iterate method. To handle this the code was reworked to use the new ->iterate interface. Care was taken to keep the majority of changes confined to the ZPL layer which is already Linux specific. However, minor changes were required to the common zfs_readdir() function. Compatibility with older kernels was accomplished by adding versions of the trivial dir_emit* helper functions. Also the various *_readdir() functions were reworked in to wrappers which create a dir_context structure to pass to the new *_iterate() functions. Unfortunately, the new dir_emit* functions prevent us from passing a private pointer to the filldir function. The xattr directory code leveraged this ability through zfs_readdir() to generate the list of xattr names. Since we can no longer use zfs_readdir() a simplified zpl_xattr_readdir() function was added to perform the same task. Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs#1653 Issue openzfs#1591
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Commit torvalds/linux@2233f31
replaced ->readdir() with ->iterate() in struct file_operations.
All filesystems must now use the new ->iterate method.
To handle this the code was reworked to use the new ->iterate
interface. Care was taken to keep the majority of changes
confined to the ZPL layer which is already Linux specific.
However, minor changes were required to the common zfs_readdir()
function.
Compatibility with older kernels was accomplished by adding
versions of the trivial dir_emit* helper functions. Also the
various *_readdir() functions were reworked in to wrappers
which create a dir_context structure to pass to the new
*_iterate() functions.
This all resulted in a nice simplication of the existing
core, this is particularly true for the control directory
implementation in zpl_ctldir.c.
Signed-off-by: Brian Behlendorf behlendorf1@llnl.gov